Check secondary motd in extension to prevent errors

Author: rtm516

bootstrap/geyser/src/main/java/com/rtm516/mcxboxbroadcast/bootstrap/geyser/MCXboxBroadcastExtension.java

@@ -217,8 +217,14 @@ public void onBedrockPing(GeyserBedrockPingEvent event) {
             return;
         }
 
+        // Fallback to the gamertag if the host name is empty
+        String hostName = event.secondaryMotd();
+        if (hostName == null || hostName.isEmpty()) {
+            hostName = sessionManager.getGamertag();
+        }
+
         // Allows support for motd and player count passthrough
-        sessionInfo.setHostName(event.secondaryMotd());
+        sessionInfo.setHostName(hostName);
         sessionInfo.setWorldName(event.primaryMotd());
 
         sessionInfo.setPlayers(event.playerCount());