title: How can I access the value of 'imageCaption' field of a ATNewsItem object?
body: <p>How can I access the value of <code>imageCaption</code> field of a ATNewsItem object?</p>
  
  <p>I tried <code>news_item_obj.getField('imageCaption')</code> but the result is always <code>None</code>.</p>