Look for name, topic in the event content rather than the event itself when...

Look for name, topic in the event content rather than the event itself when persisting room name and topic events

synapse/storage/room.py

@@ -135,26 +135,26 @@ class RoomStore(SQLBaseStore):
         defer.returnValue(ret)
 
     def _store_room_topic_txn(self, txn, event):
-        if hasattr(event, "topic"):
+        if hasattr(event, "content") and "topic" in event.content:
             self._simple_insert_txn(
                 txn,
                 "topics",
                 {
                     "event_id": event.event_id,
                     "room_id": event.room_id,
-                    "topic": event.topic,
+                    "topic": event.content["topic"],
                 }
             )
 
     def _store_room_name_txn(self, txn, event):
-        if hasattr(event, "name"):
+        if hasattr(event, "content") and "name" in event.content:
             self._simple_insert_txn(
                 txn,
                 "room_names",
                 {
                     "event_id": event.event_id,
                     "room_id": event.room_id,
-                    "name": event.name,
+                    "name": event.content["name"],
                 }
             )