/**
  * Fetch the html code to display the field value in tooltip
  * 
  * @param Tracker_Artifact $artifact
  * @param Tracker_Artifact_ChangesetValue_Integer $value The changeset value of this field
  * @return string The html code to display the field value in tooltip
  */
 protected function fetchTooltipValue(Tracker_Artifact $artifact, Tracker_Artifact_ChangesetValue $value = null)
 {
     $html = '';
     if ($value) {
         $html .= $value->getInteger();
     }
     return $html;
 }