In fact, the software-properties-gtk crash exposes exactly the same problem: Stuff _("Other") into the tree model, and None comes out. So I'm 90% sure that this is a perfect duplicate of bug 905602.
In fact, the software- properties- gtk crash exposes exactly the same problem: Stuff _("Other") into the tree model, and None comes out. So I'm 90% sure that this is a perfect duplicate of bug 905602.