@Override
    public <A> A get(final String label) {
        throw Path.Exceptions.stepWithProvidedLabelDoesNotExist(label);
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/EmptyPath.java