Fix teardown

feudal/backend/tests.py

@@ -98,19 +98,24 @@ class BaseTestCase(TestCase):
     def tearDownClass(cls):
         # delete in reverse order
         for member in [
-                cls.key,
-                cls.service_one,
-                cls.service_two_a,
-                cls.service_two_b,
-                cls.site,
-                cls.site2,
-                cls.user,
-                cls.group_none,
-                cls.group_one,
-                cls.group_two,
-                cls.idp,
+                'key',
+                'service_one',
+                'service_two_a',
+                'service_two_b',
+                'site',
+                'site2',
+                'user',
+                'group_none',
+                'group_one',
+                'group_two',
+                'idp',
         ]:
-            member.delete()
+            if hasattr(cls, member):
+                try:
+                    getattr(cls, member).delete()
+                except:
+                    # pylint: disable=bare-except
+                    pass
 
 
 # the user is logged in using session authentication