src/main/java/com/workplacesystems/utilsj/collections/TransactionalBidiTreeMap.java
private static <K,V> boolean isRed(final Node<K,V> node, final int index) {

        return ((node == null)
                ? false
                : node.isRed(index));
    }
private static <K,V> boolean isRed(final Node<K,V> node, final int index) {

        return ((node == null)
                ? false
                : node.isRed(index));
    }
is the specified node red? if the node does not exist, no, it's
black, thank you

@param node the node (may be null) in question
@param index KEY or VALUE