Importing xodr files with only one road

When an xodr file is comprised of a single road, OpenDriveActor fails to generate VehicleSpawnPoints and RoutePlanner nodes.

To reproduce - export a scene from RoadRunner that has only one road, import in a build from source, and try to create RoutePlanner nodes & SpawnPoints from OpenDriveActor

Hi Danny, I’ve only tested on our maps. I will create a new one with only one road and tested.