void uninitializeBlock() throws IOException {
		lastSubBlock = null;
		for (SubMemoryBlock subBlock : subBlocks) {
			subBlock.delete();
		}
		subBlocks.clear();
		DBRecord subRecord = adapter.createSubBlockRecord(id, 0, length,
			MemoryMapDBAdapter.SUB_TYPE_UNINITIALIZED, 0, 0);
		subBlocks.add(new UninitializedSubMemoryBlock(adapter, subRecord));

	}
Get collection of blocks which map onto this block.

@return collection of blocks which map onto this block or null if none identified
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/mem/MemoryBlockDB.java