Comment 1 for bug 830634

A pdb shows that method_name is a dbus.proxies._ProxyMethod. This seems to be a callable itself.

I think there's another bug lurking here though, as the meth it tries to getattr is never actually used. Maybe it should be returned? Not knowing what is really going on I tried various things, but to no avail - I only get crashes later on
in get_version.