Issue description:
Getting crashes on my community server when someone makes a dimension that has the same name as an existing dimension. There should be system in place to catch this so that servers don't crash and instead the player is informed that such a dimension cannot be created with that ID. I can provide additional logs if necessary.

Steps to reproduce:

Versions:

• Minecraft: 1.16.5
• Forge: 36.1.2
• CompatLayer (only if on Minecraft 1.10 or 1.11):
• McJtyLib: mcjtylib-1.16-5.0.19.jar
• RFTools: rftoolsdim-1.16-7.0.7-beta.jar

Possibly incompatible mods and versions:

Relevant logs, if any:
https://pastebin.com/Hn5fsDxd

So I’m a moron and didn’t realize there were separate repos for each of the rftools mods which explains why I thought it was odd there wasn’t already a bug report about this. Anyway gonna close this and leave a reference to an already opened issue for tracking and information purposes.

McJtyMods/RFToolsDimensions#336