hide elemnt using CSS 3

hide elemnt using CSS 3

just wondering is their are away to hide the strong tags if the ul element
don't have child is CSS
<div class="lower lts-blue">
<strong>Interest Focus</strong>:
<br>
<strong>Skills</strong>:
<ul id="dnn_ctr2446_View_blSkills" class="tags">
<li><a href="">Observing</a></li><li><a href="">Comparing &amp;
Contrasting</a></li>
</ul>
<br>
<strong>Type</strong>:
<ul id="dnn_ctr2446_View_blType" class="tags">
<li><a href="">Exemplars</a></li>
</ul>
</div>