error while collapsing tree in advanced preferences
occurs when a child element is selected.
eg : expand accounts node, select the first account, collapse accounts node
Traceback (most recent call last):
File "/usr/share/gajim/src/advanced.py", line 103, in on_advanced_treeview_selection_changed
opt = iter[0][iter[1]][0]
TypeError: could not parse subscript as a tree path