Backends provided no user object

[skjnldsv]

Cannot unlock file within groupfolder

unlocking File #4376970

In Root.php line 345:
                                    
  [OC\User\NoUserException]         
  Backends provided no user object  
                                    

Exception trace:
  at /var/www/cloud.nextcloud.com/nextcloud/lib/private/Files/Node/Root.php:345
 OC\Files\Node\Root->getUserFolder() at n/a:n/a
 call_user_func_array() at /var/www/cloud.nextcloud.com/nextcloud/lib/private/Files/Node/LazyFolder.php:64
 OC\Files\Node\LazyFolder->__call() at /var/www/cloud.nextcloud.com/nextcloud/lib/private/Files/Node/LazyRoot.php:38
 OC\Files\Node\LazyRoot->getUserFolder() at /var/www/cloud.nextcloud.com/nextcloud/apps/files_lock/lib/Service/FileService.php:47
 OCA\FilesLock\Service\FileService->getFileFromId() at /var/www/cloud.nextcloud.com/nextcloud/apps/files_lock/lib/Service/LockService.php:262
 OCA\FilesLock\Service\LockService->unlockFile() at /var/www/cloud.nextcloud.com/nextcloud/apps/files_lock/lib/Command/Lock.php:205
 OCA\FilesLock\Command\Lock->unlockFile() at /var/www/cloud.nextcloud.com/nextcloud/apps/files_lock/lib/Command/Lock.php:116
 OCA\FilesLock\Command\Lock->execute() at /var/www/cloud.nextcloud.com/nextcloud/3rdparty/symfony/console/Command/Command.php:326
 Symfony\Component\Console\Command\Command->run() at /var/www/cloud.nextcloud.com/nextcloud/core/Command/Base.php:161
 OC\Core\Command\Base->run() at /var/www/cloud.nextcloud.com/nextcloud/3rdparty/symfony/console/Application.php:1078
 Symfony\Component\Console\Application->doRunCommand() at /var/www/cloud.nextcloud.com/nextcloud/3rdparty/symfony/console/Application.php:324
 Symfony\Component\Console\Application->doRun() at /var/www/cloud.nextcloud.com/nextcloud/3rdparty/symfony/console/Application.php:175
 Symfony\Component\Console\Application->run() at /var/www/cloud.nextcloud.com/nextcloud/lib/private/Console/Application.php:183
 OC\Console\Application->run() at /var/www/cloud.nextcloud.com/nextcloud/console.php:87
 require_once() at /var/www/cloud.nextcloud.com/nextcloud/occ:11

[juliusknorr]

I can reproduce, a quick fix would be #452

Though the command is rather unintuitive as it basically requires a user id to be passed to work in all cases, but that is not required from the arguments.

I'll think a bit how we can refactor the command in general to further improve this.