BETA: Fixing some NPE's that recently appeared.

	* Patch by: malyelfik

L2J_Server_BETA/java/com/l2jserver/gameserver/model/actor/L2Attackable.java

@@ -1343,7 +1343,7 @@ public class L2Attackable extends L2Npc
 			
 			double dropChance = drop.getChance();
 			
-			if (Config.RATE_DROP_ITEMS_ID.get(drop.getItemId()) != 0)
+			if (Config.RATE_DROP_ITEMS_ID.containsKey(drop.getItemId()))
 				dropChance *= Config.RATE_DROP_ITEMS_ID.get(drop.getItemId());
 			else
 				dropChance *= isRaid() && !isRaidMinion() ? Config.RATE_DROP_ITEMS_BY_RAID : Config.RATE_DROP_ITEMS;