Custom Category Placeholder (parsing other shortcodes)

<?php
/**
 * Changes the default booking status being searched for on booking admin tables, and can be extended to change other default features.
 * For installation instructions, see here - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
 */
function my_em_placeholder_mod($replace, $EM_Category, $result){
    switch( $result ){
        case '#_CATEGORYDESCRIPTION':
            $replace = do_shortcode($EM_Category->description);
            break;
    }
    return $replace;
}
add_filter('em_category_output_placeholder','my_em_placeholder_mod',1,3);