See discussion here: https://code.djangoproject.com/ticket/21794
To summarise, when an abstract model class has no app_label, Django
currently says:
RemovedInDjango19Warning: Model class [model] doesn't declare an
explicit app_label and either isn't in an application in INSTALLED_APPS or
else was imported before its application was loaded. This will no longer be
supported in Django 1.9.
However, if I add app_label = None to the abstract model, Django thinks all
inheriting models are in an app labelled None. I think the solution is
simply to silence the warning. I'm happy to submit a pull request if the
core devs agree.
Cheers,
Greg
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