Fix full text search for groupfolders

[MorrisJobke]

How to reproduce:

• have a group folder
• enable full text search
• actual: the initial scan works until the group folder is scanned
• expected: initial scan of the full text search works

Fixes following error:

An unhandled exception has been thrown:
Error: Call to a member function getUID() on null in /var/www/nextcloud/lib/private/Share20/Manager.php:1433
Stack trace:
#0 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/LocalFilesService.php(162): OC\Share20\Manager->getAccessList(Object(OC\Files\Node\Folder), true, true)
#1 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(667): OCA\Files_FullTextSearch\Service\LocalFilesService->getShareUsersFromFile(Object(OC\Files\Node\Folder), Array)
#2 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(596): OCA\Files_FullTextSearch\Service\FilesService->updateShareNames(Object(OCA\Files_FullTextSearch\Model\FilesDocument), Object(OC\Files\Node\Folder))
#3 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(570): OCA\Files_FullTextSearch\Service\FilesService->updateDocumentAccess(Object(OCA\Files_FullTextSearch\Model\FilesDocument), Object(OC\Files\Node\Folder))
#4 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(551): OCA\Files_FullTextSearch\Service\FilesService->updateFilesDocumentFromFile(Object(OCA\Files_FullTextSearch\Model\FilesDocument), Object(OC\Files\Node\Folder))
#5 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(445): OCA\Files_FullTextSearch\Service\FilesService->updateFilesDocument(Object(OCA\Files_FullTextSearch\Model\FilesDocument))
#6 /var/www/nextcloud/apps/files_fulltextsearch/lib/Provider/FilesProvider.php(246): OCA\Files_FullTextSearch\Service\FilesService->generateDocument(Object(OCA\Files_FullTextSearch\Model\FilesDocument))
#7 /var/www/nextcloud/apps/fulltextsearch/lib/Service/IndexService.php(314): OCA\Files_FullTextSearch\Provider\FilesProvider->fillIndexDocument(Object(OCA\Files_FullTextSearch\Model\FilesDocument))
#8 /var/www/nextcloud/apps/fulltextsearch/lib/Service/IndexService.php(194): OCA\FullTextSearch\Service\IndexService->indexDocuments(Object(OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform), Object(OCA\Files_FullTextSearch\Provider\FilesProvider), Array, Object(OCA\FullTextSearch\Model\IndexOptions))
#9 /var/www/nextcloud/apps/fulltextsearch/lib/Command/Index.php(408): OCA\FullTextSearch\Service\IndexService->indexProviderContentFromUser(Object(OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform), Object(OCA\Files_FullTextSearch\Provider\FilesProvider), 'ABC', Object(OCA\FullTextSearch\Model\IndexOptions))
#10 /var/www/nextcloud/apps/fulltextsearch/lib/Command/Index.php(272): OCA\FullTextSearch\Command\Index->indexProvider(Object(OCA\Files_FullTextSearch\Provider\FilesProvider), Object(OCA\FullTextSearch\Model\IndexOptions))
#11 /var/www/nextcloud/3rdparty/symfony/console/Command/Command.php(255): OCA\FullTextSearch\Command\Index->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#12 /var/www/nextcloud/core/Command/Base.php(166): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#13 /var/www/nextcloud/3rdparty/symfony/console/Application.php(946): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /var/www/nextcloud/3rdparty/symfony/console/Application.php(248): Symfony\Component\Console\Application->doRunCommand(Object(OCA\FullTextSearch\Command\Index), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#15 /var/www/nextcloud/3rdparty/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#16 /var/www/nextcloud/lib/private/Console/Application.php(213): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#17 /var/www/nextcloud/console.php(96): OC\Console\Application->run()
#18 /var/www/nextcloud/occ(11): require_once('/var/www/nextcl...')
#19 {main}

cc @daita @icewind1991

Fix #15074

[ArtificialOwl]

Cannot reproduce myself the issue, but code is good enough (for me)

[ArtificialOwl]

/backport to stable16

[ArtificialOwl]

/backport to stable15

[backportbot-nextcloud]

backport to stable16 in #16082

[backportbot-nextcloud]

backport to stable15 in #16083

[Omaha2002]

This bug seems to have returned in NC21:

An unhandled exception has been thrown:
Error: Call to a member function getOwner() on null in /var/www/nextcloud/lib/private/Share20/Manager.php:1651
Stack trace:
#0 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/LocalFilesService.php(163): OC\Share20\Manager->getAccessList()
#1 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(795): OCA\Files_FullTextSearch\Service\LocalFilesService->getShareUsersFromFile()
#2 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(725): OCA\Files_FullTextSearch\Service\FilesService->updateShareNames()
#3 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(699): OCA\Files_FullTextSearch\Service\FilesService->updateDocumentAccess()
#4 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(680): OCA\Files_FullTextSearch\Service\FilesService->updateFilesDocumentFromFile()
#5 /var/www/nextcloud/apps/files_fulltextsearch/lib/Service/FilesService.php(571): OCA\Files_FullTextSearch\Service\FilesService->updateFilesDocument()
#6 /var/www/nextcloud/apps/files_fulltextsearch/lib/Provider/FilesProvider.php(288): OCA\Files_FullTextSearch\Service\FilesService->generateDocument()
#7 /var/www/nextcloud/apps/fulltextsearch/lib/Service/IndexService.php(317): OCA\Files_FullTextSearch\Provider\FilesProvider->fillIndexDocument()
#8 /var/www/nextcloud/apps/fulltextsearch/lib/Service/IndexService.php(204): OCA\FullTextSearch\Service\IndexService->indexDocuments()
#9 /var/www/nextcloud/apps/fulltextsearch/lib/Command/Index.php(410): OCA\FullTextSearch\Service\IndexService->indexProviderContentFromUser()
#10 /var/www/nextcloud/apps/fulltextsearch/lib/Command/Index.php(273): OCA\FullTextSearch\Command\Index->indexProvider()
#11 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Command/Command.php(255): OCA\FullTextSearch\Command\Index->execute()
#12 /var/www/nextcloud/core/Command/Base.php(169): Symfony\Component\Console\Command\Command->run()
#13 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(1009): OC\Core\Command\Base->run()
#14 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(273): Symfony\Component\Console\Application->doRunCommand()
#15 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(149): Symfony\Component\Console\Application->doRun()
#16 /var/www/nextcloud/lib/private/Console/Application.php(215): Symfony\Component\Console\Application->run()
#17 /var/www/nextcloud/console.php(100): OC\Console\Application->run()
#18 /var/www/nextcloud/occ(11): require_once('/var/www/nextcl...')

versions:

Server version: 21.0.2