/**
  * Exclude certain reports classes from the list of Reports in the CMS
  * @param $reportClass Can be either a string with the report classname or an array of reports classnames
  */
 public static function add_excluded_reports($reportClass)
 {
     if (is_array($reportClass)) {
         self::$excluded_reports = array_merge(self::$excluded_reports, $reportClass);
     } else {
         if (is_string($reportClass)) {
             //add to the excluded reports, so this report doesn't get used
             self::$excluded_reports[] = $reportClass;
         }
     }
 }