*Fix a crash by looting player's corpse when the bg is unloaded.

--HG--
branch : trunk

src/game/Map.cpp

@@ -1107,6 +1107,7 @@ void Map::RemoveAllPlayers()
 {
     if(HavePlayers())
     {
+        // this is happening for bg
         sLog.outError("Map::UnloadAll: there are still players in the instance at unload, should not happen!");
 
         for(MapRefManager::iterator itr = m_mapRefManager.begin(); itr != m_mapRefManager.end(); ++itr)

src/game/Player.cpp

@@ -7818,7 +7818,8 @@ void Player::SendLoot(uint64 guid, LootType loot_type)
             bones->lootForBody = true;
             uint32 pLevel = bones->loot.gold;
             bones->loot.clear();
-            if(GetBattleGround()->GetTypeID() == BATTLEGROUND_AV)
+            if(BattleGround *bg = GetBattleGround())
+                if(bg->GetTypeID() == BATTLEGROUND_AV)
                     loot->FillLoot(1, LootTemplates_Creature, this, true);
             // It may need a better formula
             // Now it works like this: lvl10: ~6copper, lvl70: ~9silver