[1.7.x] Fixed #24332 -- Fixed contrib.sites create_default_site() when...

    if not router.allow_migrate(using, Site):

        return

    if not Site.objects.exists():

    if not Site.objects.using(using).exists():

        # The default settings set SITE_ID = 1, and some tests in Django's test

        # suite rely on this value. However, if database sequences are reused

        # (e.g. in the test suite after flush/syncdb), it isn't guaranteed that

        self.assertEqual(Site.objects.count(), 1)

    @unittest.skipIf('other' not in connections, "Requires 'other' database connection.")

    def test_multi_db(self):

    def test_multi_db_with_router(self):

        """

        #16353, #16828 - The default site creation should respect db routing.

        """

        finally:

            router.routers = old_routers

    @unittest.skipIf('other' not in connections, "Requires 'other' database connection.")

    def test_multi_db(self):

        create_default_site(self.app_config, using='default', verbosity=0)

        create_default_site(self.app_config, using='other', verbosity=0)

        self.assertTrue(Site.objects.using('default').exists())

        self.assertTrue(Site.objects.using('other').exists())

    def test_save_another(self):

        """

        #17415 - Another site can be created right after the default one.

* Fixed a regression that prevented custom fields inheriting from

  ``ManyToManyField`` from being recognized in migrations (:ticket:`24236`).

* Fixed crash in ``contrib.sites`` migrations when a default database isn't

  used (:ticket:`24332`).