(svn r11275) -Fix: oldloader crashing when referencing a vehicle that is not yet loaded.

src/oldloader.cpp

@@ -1231,7 +1231,7 @@ bool LoadOldVehicle(LoadgameState *ls, int num)
 			default:   v->spritenum >>= 1; break;
 		}
 
-		if (_old_next_ptr != 0xFFFF) v->next = GetVehicle(_old_next_ptr);
+		if (_old_next_ptr != 0xFFFF) v->next = GetVehiclePoolSize() <= _old_next_ptr ? new (_old_next_ptr) InvalidVehicle() : GetVehicle(_old_next_ptr);
 
 		v->string_id = RemapOldStringID(_old_string_id);