List WordPress category terms, apply parent class to any terms with children

stackex_168749.php

<?php
    $terms = get_terms('category');
    if ( !empty( $terms ) && !is_wp_error( $terms ) ){
    foreach( get_terms( 'category', array( 'hide_empty' => false, 'parent' => 0 ) ) as $parent_term ) {
        $term_children = get_term_children($parent_term->term_id, 'category'); ?>
        <li class="term_item<?php echo ($term_children ? ' parent' : ''); ?>" data-hook="<?php echo $parent_term->slug; ?>">
            <a href="<?php echo home_url(); ?>/products/<?php echo $parent_term->slug; ?>"><?php echo $parent_term->name; ?></a>                
        </li>
    <?php }
} ?>