server/onyx/include/admin/exercice.php

<?php

if(!defined('ONYX')) exit;

$p = $out[0];

//TODO maybe move the try catch to index.html ?
try
{
  if (isset($p[2]))
  {
    $tmp = explode("-", $p[2]);
    $id = intval($tmp[0]);
    if ($id == 0)
      return "404";
    $theme = new Theme($id);
    $template->assign("theme", $theme);
  }

  if (isset($p[3]))
    $template->assign("ex", new Exercice($p[3], $theme));
}
catch (ThemeNotFoundException $e)
{
  return "404";
}
catch(ExerciceNotFoundException $e)
{
  return "404";
}
catch(ExerciceNotFoundException $e)
{
  return "404";
}

return SALT_ADMIN."/exercice";