Errors on Quiz review page if there is no entry for the quiz in the quiz_feedback table

When reviewing a quiz that has no entry in the quiz_feedback table I get the following errors (below) because it is trying to use the id and feedbacktextformat retrieved feedback row.

In the quiz_feedback_for_grade() function it is already setting feedbacktext = '' if it's empty, maybe in there it could check if there was an id retrieved, and if not just bomb out of the function?

! ) Notice: Undefined property: stdClass::$id in /fs1/www_root/jecb5/ou-moodle2/mod/quiz/locallib.php on line 471
Call Stack

1. Time Memory Function Location
   1 0.0000 626216 {main}( ) ../review.php:0
   2 1.0203 17787944 quiz->get_overall_feedback( ) ../review.php:203
   3 1.0203 17787944 quiz_feedback_for_grade( ) ../attemptlib.php:293
   
   ( ! ) Notice: Undefined property: stdClass::$feedbacktextformat in /fs1/www_root/jecb5/ou-moodle2/mod/quiz/locallib.php on line 472
   Call Stack
   # Time Memory Function Location
   1 0.0000 626216 {main}

   ( ) ../review.php:0
   2 1.0203 17787944 quiz->get_overall_feedback( ) ../review.php:203
   3 1.0203 17787944 quiz_feedback_for_grade( ) ../attemptlib.php:293