Comment 6 for bug 471462

Thanks for the reminder Francesco. This should fix it:

http://git.gnome.org/cgit/kupfer/commit/?id=7b5f8c09053623130e0e4cb2662697ba210c5311

(I don't have xdg user dirs here, so it returns None here. But it's documented to do the right thing.. which is really convenient for Kupfer when things are like that.)