Fix mock conflict resolution

multischleuder/test/test_multilist.py

@@ -17,7 +17,8 @@ def _resolve(target: str,
     # Mock conflict resolution that does not send or prepare messages
     subs: Dict[str, List[SchleuderSubscriber]] = {}
     for s in subscriptions:
-        subs.setdefault(s.email, []).append(s)
+        if s.key is not None:
+            subs.setdefault(s.email, []).append(s)
     return [min(s, key=lambda x: x.created_at) for s in subs.values()]
 
 
@@ -116,6 +117,8 @@ def _get_subs(schleuder: SchleuderList):
     elif schleuder.id == 6:
         return [
             SchleuderSubscriber(10, 'aaron.example@example.org', key9, schleuder.id, date2),
+            # No key, should not be subscribed
+            SchleuderSubscriber(11, 'arno.example@example.org', None, schleuder.id, date1),
         ]
     else:
         return []