Fixed #23618 -- Allowed apps with no models to still have migrations

        self.unmigrated_apps = set()

        self.migrated_apps = set()

        for app_config in apps.get_app_configs():

            if app_config.models_module is None:

                continue

            # Get the migrations module directory

            module_name = self.migrations_module(app_config.label)

            was_loaded = module_name in sys.modules

* The :class:`~django.db.migrations.operations.RunSQL` operation can now handle

  parameters passed to the SQL statements.

* It is now possible to have migrations (most probably :ref:`data migrations

  <data-migrations>`) for applications without models.

Models

^^^^^^