fixed error in theme management commands in django 2.0

openedx/core/djangoapps/theming/management/commands/tests/test_create_sites_and_configurations.py

@@ -86,7 +86,7 @@ class TestCreateSiteAndConfiguration(TestCase):
         self.assertTrue(service_user[0].is_staff)
         self.assertTrue(service_user[0].is_superuser)
 
-        user_profile = UserProfile.objects.filter(user=service_user)
+        user_profile = UserProfile.objects.filter(user=service_user[0])
         self.assertEqual(len(user_profile), 1)
         return service_user
 
@@ -96,7 +96,7 @@ class TestCreateSiteAndConfiguration(TestCase):
         """
         service_user = self._assert_service_user_is_valid("ecommerce_worker")
 
-        clients = Application.objects.filter(user=service_user)
+        clients = Application.objects.filter(user=service_user[0])
 
         self.assertEqual(len(clients), len(SITES))
 
@@ -132,7 +132,7 @@ class TestCreateSiteAndConfiguration(TestCase):
         """
         service_user = self._assert_service_user_is_valid("lms_catalog_service_user")
 
-        clients = Application.objects.filter(user=service_user)
+        clients = Application.objects.filter(user=service_user[0])
 
         self.assertEqual(len(clients), len(SITES))