File "/home/travis/build/mfrasca/bauble.classic/bauble/editor.py", line 1085, in set_content
os.path.join(prefs.prefs['picture_root'], text))
File "/home/travis/virtualenv/python2.7.9/lib/python2.7/posixpath.py", line 75, in join
if b.startswith('/'):
AttributeError: 'NoneType' object has no attribute 'startswith'
https://travis-ci.org/mfrasca/bauble.classic/jobs/59629650
both same error: