`AttributeError` when `app_config` is missing attribute `models_module` in contenttypes/mananagent.py

[Clinton Christian]

`

if not app_config.models_module:

return

`

The return statement is never reached since if app_config doesn't have a models_module attribute it raises an AttributeError.

Regardless of whether to allow the return statement to catch or return an AttributeError, this code should perhaps be changed to be more clear. I suggest either raising an AttributeError explicitly or using gettattr.

​https://github.com/django/django/pull/5338