[Doc Repo] Remove superfluous session checks generating PHP Notices (#…

…3017)

The ajax script was duplicating code that was already run from AjaxHelper.php, so is removed.

modules/document_repository/ajax/GetFile.php

@@ -4,7 +4,7 @@
  * This ensures that the file exists and the user is logged in to
  * Loris before trying to return the file to the user.
  *
- * PHP Version 5
+ * PHP Version 7
  *
  *  @category Loris
  *  @package  Document_Repository
@@ -28,14 +28,6 @@
     __DIR__ . "/../php/libraries"
 );
 
-// Ensures the user is logged in, and parses the config file.
-require_once "NDB_Client.class.inc";
-$client = new NDB_Client();
-$client->initialize("../project/config.xml");
-
-// Checks that config settings are set
-$config =& NDB_Config::singleton();
-
 $file = $_GET['File'];
 
 // Ensure file exists in the document_repository table before serving