[BUG_SP] Turn arounds rely on pathfinder may cause issue if pathfinder can't find a path

[pops64]

Currently there is no logic to prevent pathfinder from giving up and creates a endless loop. This will be fixed as this is game breaking. The other better solution would be to fall back to a programed turn on field maneuver. This may or may not be possible as most of the code that is used to do this was never carried forward from FS19 as trailer turns are handled differently and makes it currently impossible to use anything but the pathfinder functions