[BUGFIX] Handle offline storages in filemounts gracefully

If the storage selected in a `sys_filemounts` record has been set to
offline, the `sys_filemounts` records must still be editable.

This is also valid for any other folder selection, and therefore the
exception must be handled.

Resolves: #108167
Releases: main, 13.4
Change-Id: I2fcd882bd861fbf0ba5cf493089cc8def3c20c6c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/91759
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>

Author: georgringer

typo3/sysext/backend/Classes/Form/FormDataProvider/TcaFolder.php

@@ -18,6 +18,7 @@
 namespace TYPO3\CMS\Backend\Form\FormDataProvider;
 
 use TYPO3\CMS\Backend\Form\FormDataProviderInterface;
+use TYPO3\CMS\Core\Resource\Exception\InsufficientFolderAccessPermissionsException;
 use TYPO3\CMS\Core\Resource\Exception\ResourceDoesNotExistException;
 use TYPO3\CMS\Core\Resource\Folder;
 use TYPO3\CMS\Core\Resource\ResourceFactory;
@@ -74,7 +75,7 @@ public function addData(array $result)
                             'folder' => $folder,
                         ];
                     }
-                } catch (ResourceDoesNotExistException) {
+                } catch (ResourceDoesNotExistException | InsufficientFolderAccessPermissionsException) {
                     continue;
                 }
             }