Don't crash on bad orders

OpenRa.Game/Controller.cs

@@ -27,6 +27,7 @@ namespace OpenRa.Game
 			if (orderGenerator == null) return;
 
 			var orders = orderGenerator.Order(xy.ToInt2(), mi).ToArray();
+			orders.Where(order => order.Validate());
 			recentOrders.AddRange( orders );
 
 			var voicedActor = orders.Select(o => o.Subject)