TYPO3 Core

Using latest 6.1.10.

When a page is being rendered with a filelist CE, holding a reference to a sys_file_collection, but the sys_file_collection record got accidentally deleted by the user (by deleting its parent page), a spurious error message is shown in the frontend:

#1: PHP Catchable Fatal Error: Argument 1 passed to TYPO3\CMS\Core\Resource\FileCollectionRepository::createDomainObject() must be of the type array, boolean given, called in /typo3_src-6.1.10/typo3/sysext/core/Classes/Collection/RecordCollectionRepository.php on line 64 and defined in /typo3_src-6.1.10/typo3/sysext/core/Classes/Resource/FileCollectionRepository.php line 70 (More information)

Instead it would be helpful to show an error to the user, that there was a reference to a sys_file_collection record, for which the target doesn't exist anymore. Moreover, it would be nice to prevent dangling references at all.

Reproduce:
1. Create a page with a sys_file_collection record
2. On an other page, create a content element of type filelist, referencing the sys_file_collection from step 1
3. Delete the page created in step 1
4. Open the page created in step 2 in the FE
5. The error message ist shown
6. The error can be resolved by removing the dangling reference on page 2