title: the cmi.total_time parameter does not return anything
body: <p>I am programming a SCORM 2004 product.
  I can update the session_time, it works.
  I can set the status (passed, failed, etc...)
  I also can get the cmi.location time. No problems !</p>
  
  <p>But I don't succeed to get the total time ! (cmi.total_time).
  I have tested on 2 LMS :</p>
  
  <ul>
  <li><p>On Ganesha the API.GetValue('cmi.total_time') is an empty string.</p></li>
  <li><p>On Moodle the API.GetValue('cmi.total_time') is just a "P".</p></li>
  </ul>
  
  <p>However i do have the correct logs with correct session times.</p>
  
  <p>Anybody have an idea ?</p>
  
  <p>Thank you !</p>
  
  <p>EDIT.
  I also try on cloud.scorm.com and cmi.total_time returns each time PT0H0M0S.
  EDIT2. Ooops I deleted Donal's edit.</p>