Handle empty DB while expiring versions

Version on the FS can have no equivalent in the DB if they were created before the version naming feature. This makes sure that we catch the resulting exception and proceed as usual.

Fix nextcloud#36541

Signed-off-by: Louis Chemineau <louis@chmn.me>

apps/files_versions/lib/Storage.php

@@ -52,6 +52,7 @@
 use OCA\Files_Versions\Db\VersionsMapper;
 use OCA\Files_Versions\Events\CreateVersionEvent;
 use OCA\Files_Versions\Versions\IVersionManager;
+use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\Files\FileInfo;
 use OCP\Files\Folder;
 use OCP\Files\IRootFolder;
@@ -592,11 +593,16 @@ public static function expireOlderThanMaxForUser($uid) {
 			// Check that the version does not have a label.
 			$path = $versionsRoot->getRelativePath($info->getPath());
 			$node = $userFolder->get(substr($path, 0, -strlen('.v'.$version)));
-			$versionEntity = $versionsMapper->findVersionForFileId($node->getId(), $version);
-			$versionEntities[$info->getId()] = $versionEntity;
+			try {
+				$versionEntity = $versionsMapper->findVersionForFileId($node->getId(), $version);
+				$versionEntities[$info->getId()] = $versionEntity;
 
-			if ($versionEntity->getLabel() !== '') {
-				return false;
+				if ($versionEntity->getLabel() !== '') {
+					return false;
+				}
+			} catch (DoesNotExistException $ex) {
+				// Version on FS can have no equivalent in the DB if they were created before the version naming feature.
+				// So we ignore DoesNotExistException.
 			}
 
 			// Check that the version's timestamp is lower than $threshold