public static function addRow(DetailTable $table, $header, ?string $value): void
  {
    if ($value!==null && $value!=='')
    {
      $a = Html::generateElement('a', ['href' => 'mailto:'.$value], $value);

      $table->addRow($header, ['class' => 'email'], $a, true);
    }
    else
    {
      $table->addRow($header);
    }
  }