@SuppressWarnings("unchecked")
	public ListIterator<RedBlackEntry<K, V>> iterator(RedBlackEntry<K, V> firstEntry,
			boolean forward) {
		if (firstEntry == null) {
			return EmptyListIterator.INSTANCE;
		}
		return new RedBlackTreeIterator(firstEntry, forward);
	}
Test if the set is empty.
@return true if the set is empty.
Ghidra/Framework/Generic/src/main/java/ghidra/util/datastruct/RedBlackTree.java