Removed _modules

[gotounix]

• I think there is no longer a need for self.celery_app.loader.import_default_modules() in the admin #714

[cclauss]

flake8...................................................................Failed

django_celery_beat/admin.py:3:1: F401 'celery.utils.cached_property' imported but unused

[cclauss]

Related to #764?

• Fix Tasks list in admin #764

@zbig17 Your review, please.

[zbig17]

self.celery_app.loader.import_default_modules() is needed to have full list of available tasks. The cached_property _modules is a trick to do it once.

Usually celery configuration in the django project contains app.autodiscover_tasks(). This is lazy function, executed on receiving import_modules signal. Without calling import_default_modules, many tasks can stay undiscovered.

[auvipy]

based on #766 (comment)

We could close this, IMHO