WP: Display message if no results in category

Display message if no results

<?php

add_filter( 'display_posts_shortcode_no_results', 'be_no_results' );
/**
 * Display Posts Shortcode - Display message if no results
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/display-posts-shortcode-no-results
 *
 * @param string $output, default is empty
 * @return string $output
 */
function be_no_results( $output ) {
	$output = '<p>Sorry, there are currently no posts in this category.</p>';
	return $output;
}