When setting display name more graciously handle failures to update room state.

synapse/handlers/profile.py

@@ -212,6 +212,7 @@ class ProfileHandler(BaseHandler):
             )
 
             msg_handler = self.hs.get_handlers().message_handler
+            try:
                 yield msg_handler.create_and_send_event({
                     "type": EventTypes.Member,
                     "room_id": j.room_id,
@@ -219,3 +220,8 @@ class ProfileHandler(BaseHandler):
                     "content": content,
                     "sender": user.to_string()
                 }, ratelimit=False)
+            except Exception as e:
+                logger.warn(
+                    "Failed to update join event for room %s - %s",
+                    j.room_id, str(e.message)
+                )