Crash in RailroadTrack:getConnection()

[RenaKunisaki]

Describe the bug
Calling track:getConnection(0) on a RailroadTrack crashes the game.

fin-track-connection-crash.log

To Reproduce

1. Build a computer with CPU and Network Card (maybe the latter isn't needed?)
2. Build two train stations with a loop of track between them (maybe you can do less, I didn't check)
3. Install an EEPROM with the contents:

local ANY_STATION = assert(component.proxy(component.findComponent(classes.RailroadStation))[1], "No RailroadStation found")
print("Station:", ANY_STATION)
local track = ANY_STATION:getTrackPos()
print("track:", track)
local conn = track:getConnection(0)
print("conn:", conn)

4. Run the computer.

Expected behavior
conn should be either a RailroadTrack or nil.

Additional context
Commenting out the line local conn = track:getConnection(0) should prevent the crash.

I created this test save to ensure it's not caused by anything in my existing save. No other mods were loaded.

This method didn't crash in previous versions, so probably a game update broke it?

[wernerschram]

Hi,

I made a PR to fix this bug: #530