Issue description:

Client NPE crash when removing upgrades on a multiplayer server.

Steps to reproduce:

1. Open a electrolythic seperator
2. Remove energy upgrade
   => NPE

A hardcrash was also observed by adding upgrades to a Metallurgic infuser, no crashreport generated through, so can't confirm.

Version (make sure you are on the latest version before reporting):

Forge: 14.23.5.2838
Mekanism: 1.12.2-9.8.1.383
Other relevant version: https://www.curseforge.com/minecraft/modpacks/worldwarminecraft/files/2758854

If a (crash)log is relevant for this issue, link it here: https://gist.github.com/LemADEC/889bb17a860e9fc1df236007fad99fab

This should be fixed once we release 9.8.2. I was unable to reproduce it, but it seems pretty clear what was causing the null pointer.