private void checkBlockForJoining(MemoryBlock block) {
		checkBlock(block);
		if (block.isMapped()) {
			throw new IllegalArgumentException("Cannot join mapped blocks");
		}
	}
Check new block name for validity

@param name new block name
@throws IllegalArgumentException if invalid block name specified
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryMapDB.java