MDL-58001 mod_assign: Return early if no grade items are available

Author: tonyjbutler

mod/assign/locallib.php

@@ -8700,6 +8700,9 @@ protected function reopen_submission_if_required($userid, $submission, $addattem
                 $shouldreopen = true;
                 break;
             case ASSIGN_ATTEMPT_REOPEN_METHOD_UNTILPASS:
+                if (!is_gradable($this->course->id, 'mod', 'assign', $this->get_instance()->id)) {
+                    return false;
+                }
                 // Check the gradetopass from the gradebook.
                 $gradeitem = $this->get_grade_item();
                 if ($gradeitem) {