Comment 6 for bug 621084

Steve: looking at the branch that was merged to fix this, it seems as though the dependency on dbus in the gir was removed. As a result, adding the depend in the package is no longer necessary. To test the import from python, you'll need to install python-gobject. As gobject-introspection is meant to be language independent, having a dependency on that from the package that provides the .gir files, is wrong.

I guess there is no clear policy on such things in Debian. Perhaps there needs to be some sort of meta dependency on a "gir-parser" or something, which python-gobject, and whatever else, can all provide.