IDEA-125372 diff: fix NPE

we can't provide correct 'canNavigate' because then we'll navigate to the corresponding temporal file, that is not a desired behaviour
IDEA-127235 [regression] Changes in ValueDescriptor's names are not reflected
updated path to the gant scripts for pycharm edu.
IDEA-127235 [regression] Changes in ValueDescriptor's names are not reflected
Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/master'