self-ping: match error responses to XEP-0410

poezio/tabs/muctab.py

@@ -1151,7 +1151,8 @@ class MucTab(ChatTab):
             timeout=timeout)
 
     def on_self_ping_result(self, iq):
-        if iq["type"] == "error" and iq["error"]["condition"] != "feature-not-implemented":
+        if iq["type"] == "error" and iq["error"]["condition"] not in \
+                ("feature-not-implemented", "service-unavailable", "item-not-found"):
             self.command_cycle(iq["error"]["text"] or "not in this room")
             self.core.refresh_window()
         else:  # Re-send a self-ping in a few seconds