<script>
    {foreach from=$categories->all() item="cat"}
        {assign var="products" value=$cat->getProducts(1)}
        {if !$products}
            $('.categories-section li').each(function(){
                if($(this).find('a').text().toLowerCase() === '{$cat->title|lower}')
                    $(this).hide();
            });
        {/if}
    {/foreach}
</script>