(svn r16901) -Fix [FS#3046] (rpbs): when marking trains stuck don't reset the unload counter/stuck when the vehicle is unloading. It'll be automatically reset once the vehicle wants to leave the station

src/economy.cpp

@@ -1256,6 +1256,7 @@ void PrepareUnload(Vehicle *front_v)
 static void LoadUnloadVehicle(Vehicle *v, int *cargo_left)
 {
 	assert(v->current_order.IsType(OT_LOADING));
+	assert(v->load_unload_time_rem != 0);
 
 	/* We have not waited enough time till the next round of loading/unloading */
 	if (--v->load_unload_time_rem != 0) {