creating a new study with existing directory fails

[kcarnold]

Got this when creating a new study by selecting an existing directory:

Warning:
Sorry, an internal error occurred. Could you please send the authors the text below and a brief note about what you were doing? Thanks!
Traceback (most recent call last):
File "/data/v/lib/python2.6/site-packages/Luminoso-1.0.2-py2.6.egg/luminoso/window.py", line 163, in new_study_dialog
study = LuminosoStudy.make_new(unicode(dirname))
File "/data/v/lib/python2.6/site-packages/Luminoso-1.0.2-py2.6.egg/luminoso/study.py", line 81, in make_new
os.mkdir(destdir)
OSError: [Errno 17] File exists: ''

Maybe Luminoso should ask whether to overwrite the directory instead.

[transferred from Launchpad]