title: Null when no parameter is selected in Pentaho Report Designer
body: <p>I'm using Pentaho Report Designer Version: 8.0.0.0-28. </p>
  
  <p>When no parameter is selected, I keep seeing NULL everywhere or just blank fields.
  It seems that I have to set default values in each parameter.
  I don't want anything to display if nothing is selected, and at the same time I don't want to have NULL and blank fields.</p>
  
  <p>Any suggestions on what can I do instead?</p>