title: get_categories() only returns categories in use
body: <pre><code>$args = array(
  "type"      =&gt; "post",      
  "orderby"   =&gt; "name",
  "order"     =&gt; "ASC");
  
  $types = get_categories($args);
  </code></pre>
  
  <p>When this is executed. $types only contains "Uncategorized" since it is used as the default to my posts. There are other categories available, but they are not returned unless I have a post that uses them.
  How can I return all possible categories and not just the ones that are in use?</p>