Gdk.color_parse returns Gdk.Color instead of a tuple after updating python-gobject to 2.90.3-1svn1

I installed Oneiric Beta1, and then updated some packages, among them python-gobject (which pulled a new package, python-gobject-2). After this, System Testing (checkbox-gtk) crashes as described in bug 839675.

As indicated in that bug, the problem 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.

"

So I'm filing this bug to keep track of the fact that the API has changed.

Steps to reproduce:

1- On an Oneiric b1 system check the version of python-gobject, should be 2.28.6-4.
2- Launch a Python shell and execute:
 from gi.repository import Gdk
 Gdk.color_parse("#ffffff")
3- Result should be a tuple, like (True, <Gdk.Color(red=65535, green=65535, blue=65535)>)
4- update python-gobject by running sudo apt-get install python-gobject. This will bring in python-gobject-2 and versions will be:
python-gobject 2.90.3-1svn1
python-gobject-2 2.28.6-6svn1
5- Again, aunch a Python shell and execute:
 from gi.repository import Gdk
 Gdk.color_parse("#ffffff")
6- Result is now just a Gdk.color, like: <Gdk.Color(red=65535, green=65535, blue=65535)>