(some) inheritance are ignored if __init__.py is empty

Related to <https://bugzilla.gnome.org/show_bug.cgi?id=757509>

I try to use Doxygen with Python-code. But I have some problems with
the inheritance and how this is displayed in the generated docs.

I generated documentation with Doxygen (in default configuration) for
the code below. But the problem is that a.ABase in the inheritance tree
of B-docu is not linkable/clickable. Even when you look at the tree for
a.ABase the class B is not shown.

This depends on the existence of the __init__.py file. I don't know
why. When I delete the __init__.py everything is fine.

Can someone check that if it is reproducable?
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