Steps to reproduce the issue

I have a custom template based on Cassiopeia that does not have any folders in the media directory other than images. 5.0 Beta 3 appears to be assuming there is a CSS folder. When I click on the template styles entry for my template in the backend, I get the error:

"Joomla\Filesystem\Folder::files: Path is not a folder. Path: [ROOT]/media/templates/site/mycassiopeia/css/global/".

I am attaching my template in case you need it to repro, rename it with a ZIP extension since this bug tracker won't let me upload a ZIP. It is pretty much Cassiopeia but downloads Bootstrap from CDN and does not depend on the current Joomla system version of Bootstrap. Also attaching screenshots of the error.

Expected result

I should see my template style settings and not receive an error.

Actual result

An error is displayed.

System information (as much as possible)

MacOS Sonoma running XAMPP 8.2.4.

Additional comments

Call stack

Function Location

1 () JROOT/libraries/vendor/joomla/filesystem/src/Folder.php:337
2 Joomla\Filesystem\Folder::files() JROOT/libraries/src/Form/Field/FilelistField.php:210
3 Joomla\CMS\Form\Field\FilelistField->getOptions() JROOT/libraries/src/Form/Field/ListField.php:63
4 Joomla\CMS\Form\Field\ListField->getInput() JROOT/libraries/src/Form/FormField.php:1045
5 Joomla\CMS\Form\FormField->renderField() JROOT/layouts/joomla/edit/fieldset.php:43
6 include() JROOT/libraries/src/Layout/FileLayout.php:128
7 Joomla\CMS\Layout\FileLayout->render() JROOT/libraries/src/Layout/LayoutHelper.php:76
8 Joomla\CMS\Layout\LayoutHelper::render() JROOT/layouts/joomla/edit/params.php:170
9 include() JROOT/libraries/src/Layout/FileLayout.php:128
10 Joomla\CMS\Layout\FileLayout->render() JROOT/libraries/src/Layout/LayoutHelper.php:76
11 Joomla\CMS\Layout\LayoutHelper::render() JROOT/administrator/components/com_templates/tmpl/style/edit.php:97
12 include() JROOT/libraries/src/MVC/View/HtmlView.php:416
13 Joomla\CMS\MVC\View\HtmlView->loadTemplate() JROOT/libraries/src/MVC/View/HtmlView.php:204
14 Joomla\CMS\MVC\View\HtmlView->display() JROOT/administrator/components/com_templates/src/View/Style/HtmlView.php:86
15 Joomla\Component\Templates\Administrator\View\Style\HtmlView->display() JROOT/libraries/src/MVC/Controller/BaseController.php:697
16 Joomla\CMS\MVC\Controller\BaseController->display() JROOT/administrator/components/com_templates/src/Controller/DisplayController.php:68
17 Joomla\Component\Templates\Administrator\Controller\DisplayController->display() JROOT/libraries/src/MVC/Controller/BaseController.php:730
18 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:143
19 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
20 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:150
21 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:195
22 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:306
23 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:58
24 require_once() JROOT/administrator/index.php:32