Display grade as percentage + not yet graded + PHP 8+ Causes an error.

[jjs105]

When configuring an activity to display grades as a percentage an error occurs (PHP 8+) due to trying to divide the sting '--' by 100.

mod/turnitintooltwo/turnitintooltwo_view.class.php, line 1298
original:
$submissiongrade = round($submissiongrade / $parts[$partid]->maxmarks * 100, 1).'%';
fixed
$submissiongrade = '--' == $submissiongrade ? '--' : round($submissiongrade / $parts[$partid]->maxmarks * 100, 1).'%';

[matithyah]

Thanks for noting this - just came across it after moving our Moodle instance to PHP8.