MDL-9873 question Require question text

This commit removes the code that requires the question text
for the multianswer question type, as it is a duplicate, and
throws errors.

question/type/multianswer/edit_multianswer_form.php

@@ -88,9 +88,6 @@ class qtype_multianswer_edit_form extends question_edit_form {
         $mform->removeElement('defaultmark');
         $this->confirm = optional_param('confirm', false, PARAM_BOOL);
 
-        // Make questiontext a required field for this question type.
-        $mform->addRule('questiontext', null, 'required', null, 'client');
-
         // Display the questions from questiontext.
         if ($questiontext = optional_param_array('questiontext', false, PARAM_RAW)) {
             $this->questiondisplay = fullclone(qtype_multianswer_extract_question($questiontext));