nosyms test failed due to invalid -logdir

There is a failure for nosyms test at our AppVeyor Configuration 2013 build.

STDERR: ERROR: invalid -logdir: cannot find/write C:\projects\drmemory\build\build_drmemory-dbg-32\logs
CMake Error at runtest.cmake:331 (message):

C:/projects/drmemory/build/build_drmemory-dbg-32/bin/drmemory.exe;-debug;-dr_debug;-dr;C:/projects/drmemory/build/build_drmemory-dbg-32/dynamorio;-batch;-dr_ops;-dumpcore_mask;-dr_ops;0x87fd;-dr_ops;-stderr_mask;-dr_ops;15;-dr_ops;-msgbox_mask;-dr_ops;0;-callstack_style;0x27;-no_results_to_stderr;--;C:/projects/drmemory/build/build_drmemory-dbg-32/tests/nosyms.exe
has the wrong exit code (1): ERROR: invalid -logdir: cannot find/write
C:\projects\drmemory\build\build_drmemory-dbg-32\logs