contrib.contenttypes depends on contrib.auth

[Luc Saffre]

Currently it is not possible to successfully run test on a site that has contenttypes but not django.contrib.auth installed. That's an a limiting dependency.
I suggest to add a line in the test suite of django.contrib.contenttypes:

...
from django.contrib.auth.models import User
if not User._meta.installed: return            ## THE NEW LINE
user_ct = ContentType.objects.get_for_model(User)
...

[Luc Saffre]

Patch against rev. 15796

[anonymous]

Dupe of #14543.

[Julien Phalip]

oops, that was me...