[BUG] Setting auth=None at the router level doesn't disable auth for the router when using global auth

[joseph-sabido]

Bug Description

When using global auth like this:

api = NinjaAPI(auth=SomeAuth())

I expect to be able to exempt some routers by using auth=None at the router level:

# Either when creating the router
some_router = Router(auth=None)

# Or when registering the router
api.add_router('/some/path', some_router, auth=None)

• In both scenarios, the router paths are still being evaluated by SomeAuth.
• If auth=None is set at the endpoint level, it works as expected.

I've isolated it in this repo: https://github.com/joseph-sabido/django-router-bug/blob/master/core/api.py

Another very likely explanation, is that I'm doing it wrong 😄

Versions (please complete the following information):

• Python version: 3.9.6
• Django version: 4.2.8
• Django-Ninja version: 1.1.0
• Pydantic version: 2.5.2