[8103] More wide use IsInWorld checks and delayed at teleport operations.

* IsInWorld used to prevent return unexpected not in world objects.
* Delayed operations need to process its in world state.

Signed-off-by: VladimirMangos <vladimir@getmangos.com>

src/game/PetHandler.cpp

@@ -463,6 +463,9 @@ void WorldSession::HandlePetAbandon( WorldPacket & recv_data )
     recv_data >> guid;                                      //pet guid
     sLog.outDetail( "HandlePetAbandon. CMSG_PET_ABANDON pet guid is %u", GUID_LOPART(guid) );
 
+    if(!_player->IsInWorld())
+        return;
+
     // pet/charmed
     Creature* pet = ObjectAccessor::GetCreatureOrPetOrVehicle(*_player, guid);
     if(pet)