Respond correctly to disco queries about account JIDs

xmpp/handlers.go

@@ -319,10 +319,16 @@ func handleGetDiscoInfo(s xmpp.Sender, iq *stanza.IQ) {
 	})
 	if err != nil {
 		log.Errorf("Failed to create answer IQ: %v", err)
+		return
 	}
 
 	disco := answer.DiscoInfo()
-	disco.AddIdentity("Telegram Gateway", "gateway", "telegram")
+	_, ok := toToID(iq.To)
+	if ok {
+		disco.AddIdentity("", "account", "registered")
+	} else {
+		disco.AddIdentity("Telegram Gateway", "gateway", "telegram")
+	}
 	answer.Payload = disco
 
 	log.Debugf("%#v", answer)