html - can't use first-child css to set display -

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i using wordpress , generating code:

<aside class="left-hand-column">  <div class="textwidget">   <p></p> ...1    <div class="pdf-download">     <p> ... 2      <a href="http://www.kusuma.ee-web.co.uk/wp-content/uploads/2016/04/strategy2015-2018.pdf" target="_blank">download pdf</a>     </p>    </div>   <p></p> ...3  </div> </aside>

i want remove effects of <p></p> tag pairs.

i thought set display:none them this:

.textwidget p:first-child {     display:none; }

but making 1 , 2 p's disappear , leaving 3 - how need please?

if familiar jquery can use this

$('.textwidget p').each(function () {     if ($(this).text().length === 0) {         $(this).hide();     } });

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