I have made a little workaround (not serious tested) , in the file mod/quiz/report/overview/report.php, change the lines:
if (!$students = get_users_by_capability($context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),'','','','',$currentgroup,'',false)){
notify(get_string('nostudentsyet'));
$nostudents = true;
$studentslist = '';
} else {
$studentslist = join(',',array_keys($students));
}
to:
if (empty($currentgroup)){
$students = get_users_by_capability($context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),'','','','','','',false);
} else {
$students = get_users_by_capability($context, array('mod/quiz:reviewmyattempts', 'mod/quiz:attempt'),'','','','',$currentgroup,'',false);
}
if (!$studentslist = join(',',array_keys($students))){
notify(get_string('nostudentsyet'));
$nostudents = true;
$studentslist = '';
} else {
$studentslist = join(',',array_keys($students));
}
and you have to create some groups, now i can see this report (by selecting a group)