Core/PacketIO: Skip sending empty SMSG_UPDATE_OBJECT for transports on map changes

(cherry picked from commit f6c37f6791f1a28f5a077f251ec60a541cf0284f)

Author: Shauren

src/server/game/Maps/Map.cpp

@@ -2983,6 +2983,9 @@ void Map::SendInitTransports(Player* player)
         if (*i != player->GetTransport())
             (*i)->BuildCreateUpdateBlockForPlayer(&transData, player);
 
+    if (!transData.HasData())
+        return;
+
     WorldPacket packet;
     transData.BuildPacket(&packet);
     player->SendDirectMessage(&packet);
@@ -2996,6 +2999,9 @@ void Map::SendRemoveTransports(Player* player)
         if (*i != player->GetTransport())
             (*i)->BuildOutOfRangeUpdateBlock(&transData);
 
+    if (!transData.HasData())
+        return;
+
     WorldPacket packet;
     transData.BuildPacket(&packet);
     player->SendDirectMessage(&packet);