Exception when show_avatars_in_roster is disabled
image
can be None
in roster_window.py#L4846 when show_avatars_in_roster
is disabled, resulting in the following exception:
Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/gajim/roster_window.py", line 4846, in _fill_avatar_pixbuf_renderer
surface = image.get_property('surface')
AttributeError: 'NoneType' object has no attribute 'get_property'
Introduced in 232dc1dd.