Description of the Bug
If you use Train Dispenser Block to spawn train cart, it will completely crash.

To Reproduce
Steps to reproduce the behavior:

1. Place Train Dispenser Block
2. Open Train Dispenser Block GUI
3. Set Pattern cart & put cart on Buffer
4. Quit Train Dispenser Block GUI & use redstone block to activate.
5. Crashed.

Environment
Railcraft 12.0.0-beta-2
Forge 1.12.2-14.23.5.2796

Additional context
See the logs here: https://pastebin.com/yLYmJJZq

Strange

Uh, github forgot to close this.

You have to write either "Fixes #num" or "Closes #num" in the commit message for that to work.

Should have written #1592 Fix train dispenser crash instead.

https://help.github.com/articles/closing-issues-using-keywords/