Hello. We're migrating someone else's app that was at Django 1.5.12 and 
we're trying to bring it more up-to-date, step-by-step, starting with 
Django 1.6.11.

There's an odd thing. There were a bunch of subclasses of a Model class, 
that didn't have any database fields. Django wasn't creating nor using 
tables for them at 1.5.12. But, Django 1.6.11 keeps trying to query these 
non-existent tables for these subclasses, expecting them to have a single 
field which would just be the pointer to their superclass.

It seems the proper way to tell Django not to use tables for a class is to 
set:

class Meta:
proxy = True

But if we put this in, then when we run syncdb it strangly tries to query 
the base classes before any tables are created at all in the database.  

Any old-timers run into anything like this? Did Django 1.5 not need the 
proxy = True in the meta to avoid creating tables for subclasses of Models 
that didn't add any fields?

They are using InheritanceManager from django_model_utils. 

Thanks for any help! Banging our heads against the wall on this one for 
quite a while now...

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