title: Hide unused wordpress custom field
body: <p>I have a custom field that I need to keep for some posts but would like to hide when not used on others, slightly unsure how I can achieve this</p>
  
  <p><strong>Custom field</strong></p>
  
  <pre><code>&lt;div class="launch"&gt;    
  &lt;?php $description = get_post_meta($post-&gt;ID, "Launch", $single = true);
      if($description !== '') { echo $description; } ?&gt;
  &lt;/div&gt;&lt;!-- /Launch --&gt;
  </code></pre>