def on_delete(self):
        pass
Test that we can traverse a 'content_object' with prefetch_related() and
dataset/ETHPy150Open CenterForOpenScience/osf.io/website/addons/base/__init__.py/AddonSettingsBase.on_delete--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/tests/modeltests/prefetch_related/tests.py/GenericRelationTests.test_traverse_GFK