@Override
	@SuppressWarnings("unchecked")
	protected T nullOrUndefined(long snap, Address address) {
		return (T) manager.doCreateUndefinedUnit(snap, address, null, 0);
	}
Construct a composite view

@param manager the code manager, from which individual views are retrieved
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/listing/AbstractWithUndefinedDBTraceCodeUnitsMemoryView.java