Stop auto sort from visiting empty vehicle tiles

[Qrox]

Summary

SUMMARY: Bugfixes "Stop auto sort from visiting empty vehicle tiles"

Purpose of change

Previously when the player starts auto sort near a vehicle, all of the vehicle's cargo tiles will be visited regardless of whether the tiles contain items. This can cause unnecessary movement over the cargo tiles, which slows down auto sort, especially when the vehicle has many cargo tiles.

Describe the solution

Check if a vehicle part contains items before pathing to that part.

Testing

Started auto sort near a truck with only a few cargo tiles containing items. Only those tiles containing items were visited during auto sort.