quote on trailing ] or space, re #138

exercises/cloze_exercise.php

@@ -370,7 +370,7 @@ class cloze_exercise extends Exercise
                 foreach ($this->task['answers'][$blank] as $answer) {
                     $answer_text = $answer['text'];
 
-                    if (preg_match('/^$|^[":*~]|\||\]\]/', $answer_text)) {
+                    if (preg_match('/^$|^[":*~ ]|\||\]\]|[] ]$/', $answer_text)) {
                         $answer_text = '"' . $answer_text . '"';
                     }