Create an essay question with no feedback or general feedback. Previewing or attempting the quiz leads to a blank page. PHP error indicates:
Fatal error: Call to undefined method question_essay_qtype::extra_answer_fields() in /srv/www/htdocs/moodle_19/question/type/questiontype.php on line 440
extra_answer_fields() is NOT defined anywhere in this class or in any of its children classes. extra_question_fields(), however, is defined.