@Override
	protected void updateItem(ClassType type, boolean empty) {
		super.updateItem(type, empty);
		if (empty || type == null) {
			setText(null);
			setGraphic(null);
		} else {
			configureType(type);
		}
	}
Special value used to represent null types. Randomized to prevent abuse.
recaf-ui/src/main/java/software/coley/recaf/ui/pane/editing/assembler/TypeTableCell.java