Issue description: Creation of a RFTools Dimension using just sand as a world descriptor.

Steps to reproduce:

1. Create an empty dimension tablet
2. Place just a dimlet of (Material Sand)
3. Store and place realized dimension tablet inside of a Dimension builder.

Versions:

• Minecraft: 1.10.2
• Forge: 2316
• CompatLayer (only if on Minecraft 1.10 or 1.11): compatlayer-1.10-0.2.9
• McJtyLib: mcjtylib-1.1x-2.4.3
• RFTools: rftools-1.1x-6.13

Possibly incompatible mods:
SpongeForge
The crash report detailed that the issue of crashing was due to SpongeForge chunk loading.
https://i.imgur.com/oXFAeAw.png

Relevant logs, if any:
https://pastebin.com/WHggXbk6

What version of RFTools Dimensions?

Never mind, I see you're on 5.04. This problem was fixed in 5.05, so just update and it should work: McJtyMods/RFToolsDimensions@5a2fbc5