Fix crash in npc_escortAI::Start

Closes #812

--HG--
branch : trunk

src/bindings/scripts/base/escort_ai.cpp

@@ -454,8 +454,13 @@ void npc_escortAI::Start(bool bIsActiveAttacker, bool bRun, uint64 uiPlayerGUID,
 
     if (WaypointList.empty())
     {
-        error_db_log("TSCR: EscortAI Start with 0 waypoints (possible missing entry in script_waypoint. Quest: %u).", m_pQuestForEscort->GetQuestId());
+        if (pQuest != NULL)
-        return;
+        {
+            error_db_log("TSCR: EscortAI Start with 0 waypoints (possible missing entry in script_waypoint. Quest: %u).", m_pQuestForEscort->GetQuestId());
+            return;
+        }
+        else
+            return;
     }
 
     //set variables