Update to workOrder cleanup

src/engine/gameManager/BuildingManager.java

@@ -336,6 +336,7 @@ public enum BuildingManager {
             if (ForgeManager.vendorWorkOrderLookup.get(hirelingNPC) != null)
                 for (WorkOrder workOrder : ForgeManager.vendorWorkOrderLookup.get(hirelingNPC)) {
                     workOrder.runCompleted = true;
+                    workOrder.vendor = null;
                     DbManager.WarehouseQueries.DELETE_WORKORDER(workOrder);
                 }
         }