php - Displaying message outside of while loop

I have some working code where a directory is scanned and the PDF file results placed in a table. However, what I cannot seem to do is if there are no results then display a message in the table outside the while loop. Can someone help with this. Thanks

<?php

  // WHAT IS IN THE STORAGE DIRECTORY
  $sub = 'destcerts' . '/' . $_SESSION['kt_idcode_usr'];

  // READ THE NAMES OF FILES IN THE SUB-DIRECTORY
  $fff = new DirectoryIterator($sub);
  $sss = array();

  foreach ($fff as $filedata)
  {
    // SKIP THE "DOT" FILES
    if ($filedata->isDot()) continue;

    // ACTIVATE THIS LINE TO RESTRICT IT TO PDF FILES ONLY
    if ($filedata->getExtension() != 'pdf') continue;

    // CREATE LINKS TO THESE FILES
    $nom = $filedata->getFilename();
    $value = substr ($nom, 0, 4);

    //$_SESSION['value'] = $value;


    if($_SESSION['kt_idcode_usr'] == $value) {

      $lnk
      = '<img src="destcerts/PDF_icon_100.png" ><br /><a href="'
      . $sub
      . '/'
      . $nom
      . '" >'
      . $nom
      . '</a>'
      ;

    } 

    // COLLECT THE LINKS HERE
    $sss[] = $lnk;
  }

  // ACCUMULATE THE TABLE ROWS HERE
  $trs  = NULL;

  // COLLECT GROUPS OF FOUR
  while (!empty($sss))
  {
    $td1 = array_shift($sss) or NULL;
    $td2 = array_shift($sss) or NULL;
    $td3 = array_shift($sss) or NULL;
    $td4 = array_shift($sss) or NULL;

    // USE HEREDOC TO INSERT THESE INTO A TABLE ROW
    $tr = <<<EOD
    <tr>
    <td align="center" width="20%" >$td1</td>
    <td align="center" width="20%" >$td2</td>
    <td align="center" width="20%" >$td3</td>
    <td align="center" width="20%" >$td4</td>
    </tr>
EOD;

    // APPEND THE TABLE ROW TO THE OTHER ROWS
    $trs .= $tr;
  }

  // USE HEREDOC TO INSERT THE TABLE ROWS INTO THE TABLE
  $tab = <<<EOD
  <table id="pdfDownload" width="94%" align="center" border="1" cellspacing="10" cellpadding="0" >
  <th colspan="4">Destruction Certificates Download</th>
  <tr>
  <th ></th>
  <th></th>
  <th></th>
  <th></th>
  </tr>
  $trs
  </table>
EOD;

  // SHOW THE WORK PRODUCT
  echo $tab;
?>
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