Fixes for the Behat failures.

stack/cas/cassession.class.php

@@ -533,6 +533,10 @@ class stack_cas_session {
      * @return string
      */
     public function get_keyval_representation() {
+        if ($this->session == null) {
+            return '';
+        }
+
         $keyvals = '';
         foreach ($this->session as $cs) {
             if (null === $this->instantiated) {

tidyquestion.php

@@ -22,8 +22,6 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-defined('MOODLE_INTERNAL') || die();
-
 require_once(__DIR__.'/../../../config.php');
 
 require_once($CFG->libdir . '/questionlib.php');