Merge branch 'MDL-55993-34' of https://github.com/albertolarah/moodle into MOODLE_34_STABLE

Author: David Monllao

mod/assign/locallib.php

@@ -275,7 +275,10 @@ public function show_intro() {
     public function get_return_params() {
         global $PAGE;
 
-        $params = $PAGE->url->params();
+        $params = array();
+        if (!WS_SERVER) {
+            $params = $PAGE->url->params();
+        }
         unset($params['id']);
         unset($params['action']);
         return $params;