Drag And Drop not working

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Hello,

I'm trying to run the drag & drop command, but it fails as shown below (RIDE log) :

```
command: pybot.bat --argumentfile c:\users\win\appdata\local\temp\RIDEnli835.d\argfile.txt --listener C:\python27\lib\site-packages\robotide\contrib\testrunner\TestRunnerAgent.py:53127:False C:\Python27\Lib\site-packages\alyvix\robotproxy\alyvix_testcases\my_first_alyvix_testcase_suite.robot
=================================================================================================
My First Alyvix Testcase Suite
=================================================================================================
sample1 | FAIL |
AttributeError: 'NoneType' object has no attribute 'run_keyword'
-------------------------------------------------------------------------------------------------
My First Alyvix Testcase Suite | FAIL |
1 critical test, 0 passed, 1 failed
1 test total, 0 passed, 1 failed
=================================================================================================
Output: c:\users\win\appdata\local\temp\RIDEnli835.d\output.xml
Log: c:\users\win\appdata\local\temp\RIDEnli835.d\log.html
Report: c:\users\win\appdata\local\temp\RIDEnli835.d\report.html

test finished 20181003 15:53:14
```

Reproduce the drag-and-drop command from the RIDE log using the shown pybot.bat invocation and inspect the listener entry point in TestRunnerAgent.py. Trace why keyword dispatch reaches a None object; done means the sample1 testcase completes without the reported AttributeError and the drag-and-drop command runs successfully.

Written by the indexing model from the issue text.