In some situations the quicktoolbar of TinyMCE seems to be disabled. This happens especially when the editor text area has only a few lines (for example the introeditor in mod_resource).

When there is a tiny plugin trying to add items to the quicktoolbar in this case, tiny throws an error in the console and does not load.

Reason is that the check here https://github.com/moodle/moodle/blob/8a6e8563fdc9e9684ab628ea0274fd2277bc5265/lib/editor/tiny/amd/src/utils.js#L217 only works if the quicktoolbar object is null or undefined, but not, if it's false, which however seems to be the case for example in the introeditor when adding a mod_resource activity.

Yes, the plugins of course can do the check on their own. But the addQuickbarsToolbarItem function tries to do a check and I feel like it should also catch the case of quicktoolbar === false

Same for contextmenu.

To reproduce:

• As admin go to admin/settings.php?section=editorsettingstiny
• Enable "no auto-link" plugin
• Create a course
• Add activity "File"
• See that the intro editor is not loading and you have an error in the JS console