App without migrations depending on app with migrations fails on initial migrate call (postgres)

[Lucas Moeskops]

Simple test example:
In a new project add 'django.contrib.sites' and your main app to the INSTALLED APPS setting.
Use postgres as database.
Make a model in your main app that uses a relation to django.contrib.sites:

from django.contrib.sites.models import Site
class MyModel(models.Model):
  my_site = models.ForeignKey(Site)

Migrate the project:

python manage.py migrate

It will fail to migrate with the message: django.db.utils.ProgrammingError: relation "django_site" does not exist. This is because it tries to migrate the apps without migrations before the apps with migrations.

I guess the app should have at least one migration with a dependency to django.contrib.sites. But maybe this needs to be documented. I couldn't find it in the documentation.