title: suppress text object if field value is null in crystal
body: <p>I am trying to suppress the text value in crystal by right clicking on the text object, selecting suppress and hitting the <code>x2</code> button and adding the formula </p>
  
  <pre><code>isnull(field) 
  </code></pre>
  
  <p>When I look at the print preview the text is still there when the field value is null.</p>