Server-side error when defining multiblock cube renderer and front overlay

[tracer4b]

When trying to define front overlays and cube renderers for MBT multiblocks, only the server throws an error.
This doesn't happen on singleplayer worlds nor client-side.

crafttweaker (1).log
Versions: MBT 1.7.0, CEu 2.2.1

[eutro]

The issue arises here:

MultiblockTweaker/src/main/java/eutros/multiblocktweaker/crafttweaker/brackethandler/CubeRendererBracketHandler.java

Lines 33 to 47 in 4ea354b

	public static IICubeRenderer get(String member) {
	if (!cache.containsKey(member)) {
	ICubeRenderer cubeRenderer = ReflectionHelper.getStatic(Textures.class, member);
	if (cubeRenderer == null) {
	if (IICubeRenderer.byPath(member) != null) {
	cache.put(member, IICubeRenderer.byPath(member));
	} else {
	cache.put(member, null);
	}
	} else {
	cache.put(member, new MCICubeRenderer(cubeRenderer));
	}
	}
	return cache.get(member);
	}

Specifically, line 35 is from where the exception is thrown.

Ideally, this should just be no-op on servers (just returning a no-op IICubeRenderer), since they are (I hope) unused on the server side.