Comment 3 for bug 839675

This is caused by an API-breaking change in PyGTK:

https://bugzilla.gnome.org/show_bug.cgi?id=653462

"
Change Gdk.color_parse() to not return a tuple, instead just
return the created color or None if it wasn't possible to parse
the name into a color.

This keeps compatibility with PyGTK but breaks the current API.

"