Python automated tests crash

The scripted module tests crash for custom app, also confirmed to be the case with the template without anything additional. This happens using the latest master, on Windows 10 with Qt 5.10.1.

I cannot debug it with setting the launcher as executable, as it runs the test on a different thread. I'd appreciate any ideas. Thank you!

```
e:\e\tD\Slicer-build>ctest -C Debug -V -R py_nomainwindow_
UpdateCTestConfiguration from :E:/e/tD/Slicer-build/DartConfiguration.tcl
Parse Config file:E:/e/tD/Slicer-build/DartConfiguration.tcl
Add coverage exclude regular expressions.
Add coverage exclude: /CMakeFiles/CMakeTmp/
Add coverage exclude: .*/moc_.*
Add coverage exclude: .*/ui_.*
Add coverage exclude: .*/qrc_.*
Add coverage exclude: .*/Testing/.*
Add coverage exclude: .*Python.cxx
Add coverage exclude: .*PythonInit.cxx
Add coverage exclude: .*/DesignerPlugins/.*
Add coverage exclude: .*/generated_cpp/.*
SetCTestConfiguration:CMakeCommand:C:/Program Files/CMake/bin/cmake.exe
UpdateCTestConfiguration from :E:/e/tD/Slicer-build/DartConfiguration.tcl
Parse Config file:E:/e/tD/Slicer-build/DartConfiguration.tcl
Test project E:/e/tD/Slicer-build
Constructing a list of tests
Done constructing a list of tests
Updating test list for fixtures
Added 0 tests to meet fixture requirements
Checking test dependency graph...
Checking test dependency graph end
test 292
Start 292: py_nomainwindow_SubjectHierarchyFoldersTest1

292: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--disable-cli-modules" "--no-main-window" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Debug" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Release" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/MinSizeRel" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/RelWithDebInfo" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Loadable/SubjectHierarchy/Testing/Python', 'E:/e/tD/slicersources-src/Modules/Loadable/SubjectHierarchy/Testing/Python'], 'SubjectHierarchyFoldersTest1')"
292: Test timeout computed to be: 1500
292: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
1/11 Test #292: py_nomainwindow_SubjectHierarchyFoldersTest1 .................***Failed 2.76 sec
test 372
Start 372: py_nomainwindow_SegmentationsModuleTest1

372: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--disable-cli-modules" "--no-main-window" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Debug" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Release" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/MinSizeRel" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/RelWithDebInfo" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Loadable/Segmentations/Testing/Python', 'E:/e/tD/slicersources-src/Modules/Loadable/Segmentations/Testing/Python'], 'SegmentationsModuleTest1')"
372: Test timeout computed to be: 1500
372: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
2/11 Test #372: py_nomainwindow_SegmentationsModuleTest1 .....................***Failed 2.76 sec
test 373
Start 373: py_nomainwindow_SegmentationsModuleTest2

373: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--disable-cli-modules" "--no-main-window" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Debug" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Release" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/MinSizeRel" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/RelWithDebInfo" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Loadable/Segmentations/Testing/Python', 'E:/e/tD/slicersources-src/Modules/Loadable/Segmentations/Testing/Python'], 'SegmentationsModuleTest2')"
373: Test timeout computed to be: 1500
373: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
3/11 Test #373: py_nomainwindow_SegmentationsModuleTest2 .....................***Failed 2.82 sec
test 374
Start 374: py_nomainwindow_SegmentationWidgetsTest1

374: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--disable-cli-modules" "--no-main-window" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Debug" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/Release" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/MinSizeRel" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules/RelWithDebInfo" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Loadable/Segmentations/Testing/Python', 'E:/e/tD/slicersources-src/Modules/Loadable/Segmentations/Testing/Python'], 'SegmentationWidgetsTest1')"
374: Test timeout computed to be: 1500
374: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
4/11 Test #374: py_nomainwindow_SegmentationWidgetsTest1 .....................***Failed 2.77 sec
test 417
Start 417: py_nomainwindow_qSlicerCropVolumeSequenceModuleGenericTest

417: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/CropVolumeSequence', 'E:/e/tD/slicersources-src/Modules/Scripted/CropVolumeSequence'], 'qSlicerCropVolumeSequenceModuleGenericTest')"
417: Test timeout computed to be: 1500
417: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
5/11 Test #417: py_nomainwindow_qSlicerCropVolumeSequenceModuleGenericTest ...***Failed 2.76 sec
test 419
Start 419: py_nomainwindow_qSlicerEditorModuleGenericTest

419: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/Editor', 'E:/e/tD/slicersources-src/Modules/Scripted/Editor'], 'qSlicerEditorModuleGenericTest')"
419: Test timeout computed to be: 1500
419: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
6/11 Test #419: py_nomainwindow_qSlicerEditorModuleGenericTest ...............***Failed 2.77 sec
test 422
Start 422: py_nomainwindow_qSlicerScreenCaptureModuleGenericTest

422: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/ScreenCapture', 'E:/e/tD/slicersources-src/Modules/Scripted/ScreenCapture'], 'qSlicerScreenCaptureModuleGenericTest')"
422: Test timeout computed to be: 1500
422: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
7/11 Test #422: py_nomainwindow_qSlicerScreenCaptureModuleGenericTest ........***Failed 2.77 sec
test 425
Start 425: py_nomainwindow_qSlicerSegmentStatisticsModuleGenericTest

425: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/SegmentStatistics', 'E:/e/tD/slicersources-src/Modules/Scripted/SegmentStatistics'], 'qSlicerSegmentStatisticsModuleGenericTest')"
425: Test timeout computed to be: 1500
425: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
8/11 Test #425: py_nomainwindow_qSlicerSegmentStatisticsModuleGenericTest ....***Failed 2.81 sec
test 427
Start 427: py_nomainwindow_qSlicerSelfTestsModuleGenericTest

427: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/SelfTests', 'E:/e/tD/slicersources-src/Modules/Scripted/SelfTests'], 'qSlicerSelfTestsModuleGenericTest')"
427: Test timeout computed to be: 1500
427: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
9/11 Test #427: py_nomainwindow_qSlicerSelfTestsModuleGenericTest ............***Failed 2.85 sec
test 428
Start 428: py_nomainwindow_qSlicerDICOMModuleGenericTest

428: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/DICOM', 'E:/e/tD/slicersources-src/Modules/Scripted/DICOM'], 'qSlicerDICOMModuleGenericTest')"
428: Test timeout computed to be: 1500
428: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
10/11 Test #428: py_nomainwindow_qSlicerDICOMModuleGenericTest ................***Failed 2.85 sec
test 429
Start 429: py_nomainwindow_qSlicerDICOMPatcherModuleGenericTest

429: Test command: E:\e\tD\Slicer-build\testingTest.exe "--no-splash" "--testing" "--no-main-window" "--disable-cli-modules" "--additional-module-path" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "--additional-module-paths" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-scripted-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/cli-modules" "E:/e/tD/Slicer-build/lib/testingTest-4.11/qt-loadable-modules" "--python-code" "import slicer.testing; slicer.testing.runUnitTest(['E:/e/tD/Slicer-build/Modules/Scripted/DICOMPatcher', 'E:/e/tD/slicersources-src/Modules/Scripted/DICOMPatcher'], 'qSlicerDICOMPatcherModuleGenericTest')"
429: Test timeout computed to be: 1500
429: error: [E:/e/tD/Slicer-build/bin/Debug/testingTestApp-real.exe] exit abnormally - Report the problem.
11/11 Test #429: py_nomainwindow_qSlicerDICOMPatcherModuleGenericTest .........***Failed 2.83 sec

0% tests passed, 11 tests failed out of 11

Total Test time (real) = 30.94 sec

The following tests FAILED:
292 - py_nomainwindow_SubjectHierarchyFoldersTest1 (Failed)
372 - py_nomainwindow_SegmentationsModuleTest1 (Failed)
373 - py_nomainwindow_SegmentationsModuleTest2 (Failed)
374 - py_nomainwindow_SegmentationWidgetsTest1 (Failed)
417 - py_nomainwindow_qSlicerCropVolumeSequenceModuleGenericTest (Failed)
419 - py_nomainwindow_qSlicerEditorModuleGenericTest (Failed)
422 - py_nomainwindow_qSlicerScreenCaptureModuleGenericTest (Failed)
425 - py_nomainwindow_qSlicerSegmentStatisticsModuleGenericTest (Failed)
427 - py_nomainwindow_qSlicerSelfTestsModuleGenericTest (Failed)
428 - py_nomainwindow_qSlicerDICOMModuleGenericTest (Failed)
429 - py_nomainwindow_qSlicerDICOMPatcherModuleGenericTest (Failed)
Errors while running CTest
```

Start by reproducing the failure with the reported CTest command and inspect the testingTest.exe invocation, especially slicer.testing.runUnitTest and the --no-main-window path. Compare the listed SubjectHierarchy, Segmentations, CropVolumeSequence, Editor, ScreenCapture, SegmentStatistics, SelfTests, and DICOM tests; done means the scripted tests no longer exit abnormally on the reported Windows and Qt configuration.

Written by the indexing model from the issue text.