Hiding course category disables sending of emails even if the course itself is visible

[mariusros]

Thank you for providing this very useful plugin! I have a suggestion:

The includeinnotvisiblecourses setting is not very intuitive

moodle-mod_customcert/classes/task/issue_certificates_task.php

Line 87 in a202493

$sql .= " AND co.visible = 1 AND cat.visible = 1";

The setting itself doesn't mention course categories, only courses

so it took us a while to figure out why no emails were sent. I think either the description should be changed so it is clear that the course categorie also needs to be visible or the visibility of the category should not play a role at all.