title: If element has a child of type image - apply certain styles?
body: <p>Here's my HTML:</p>
  
  <pre><code>&lt;li&gt;
      &lt;div class="img-drop-zone"&gt;
         &lt;img src="myimage.jpg"&gt;
         &lt;div class="desc"&gt;drop img here&lt;/div&gt;
      &lt;/div&gt;
  &lt;/li&gt;
  </code></pre>
  
  <p>Sometime img-drop-zone has no image in it.</p>
  
  <p>Is there a way to target this in sass, so that when img-drop-zone has a child which is an image, set .desc to display:none</p>