@CheckForNull
    public Node getNode() {
        Jenkins j = Jenkins.getInstanceOrNull(); // TODO confirm safe to assume non-null and use getInstance()
        if (j == null) {
            return null;
        }
        if (nodeName == null) {
            return j;
        }
        return j.getNode(nodeName);
    }
@ CheckForNull public Node getNode ( ) { Jenkins j = Jenkins . getInstanceOrNull ( ) ; if ( j == null ) { return null ; } if ( nodeName == null ) { return j ; } return j . getNode ( nodeName ) ; }
Returns the {@link Node} that this computer represents.

@return
null if the configuration has changed and the node is removed, yet the corresponding {@link Computer}
is not yet gone.