'Test that request.site_theme returns None when there is no theme associated with
the current site and DEFAULT_SITE_THEME is also None.'

@override_settings(DEFAULT_SITE_THEME=None)
def test_default_site_theme_2(self):

    request = self.create_mock_get_request()
    self.assertEqual(self.site_theme_middleware.process_request(request), None)
    self.assertIsNone(request.site_theme)
