Result

jQuery

$("ul li:empty").remove();

css

ul{margin:25px;}
li{/*通常なら要素が空でも背景だけ表示されるスタイル*/
    display:block;
    margin-bottom:10px;
    padding:10px;
    background:#eee;
    width:300px;
    height: 35px;
}

html

<ul>
<li><a>one</a></li>
<li><a>two</a></li>
<li></li>
<li><a>three</a></li>
<li><a>four</a></li>
<li></li>
<li><a>five</a></li>
</ul>

Warning: include(/home/youhei0828/kachibito.net/public_html/wp-content/themes/cocoon-master/my-php/jquery-other-snippets.php): Failed to open stream: No such file or directory in /home/youhei0828/kachibito.net/public_html/wp-content/themes/kachibito7_with_cocoon_child/functions-module/shortcode/add-post-myphp.php on line 7

Warning: include(): Failed opening '/home/youhei0828/kachibito.net/public_html/wp-content/themes/cocoon-master/my-php/jquery-other-snippets.php' for inclusion (include_path='.:/opt/php-8.1.29/data/pear') in /home/youhei0828/kachibito.net/public_html/wp-content/themes/kachibito7_with_cocoon_child/functions-module/shortcode/add-post-myphp.php on line 7