Core/SmartAI: Add check to SMART_ACTION_PLAY_ANIMKIT to allow zero va…

…lue to remove animKit.
By Malcrom

src/server/game/AI/SmartScripts/SmartScriptMgr.cpp

@@ -887,7 +887,7 @@ bool SmartAIMgr::IsEventValid(SmartScriptHolder& e)
                 return false;
             break;
         case SMART_ACTION_PLAY_ANIMKIT:
-            if (!IsAnimKitValid(e, e.action.animKit.animKit))
+            if (e.action.animKit.animKit && !IsAnimKitValid(e, e.action.animKit.animKit))
                 return false;
 
             if (e.action.animKit.type > 3)