fix: Prevent crash when refreshing metadata for files without an owner #9260

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	6m 25s
integration-sqlite (collaboration_features, 8.2, main)	7m 33s
integration-sqlite (comments_features, 8.2, main)	1m 18s
integration-sqlite (dav_features, 8.2, main)	11m 44s
integration-sqlite (features, 8.2, main)	6m 1s
integration-sqlite (federation_features, 8.2, main)	8m 44s
integration-sqlite (--tags ~@large files_features, 8.2, main)	15m 26s
integration-sqlite (filesdrop_features, 8.2, main)	5m 39s
integration-sqlite (openldap_features, 8.2, main)	6m 12s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 44s
integration-sqlite (ldap_features, 8.2, main)	6m 22s
integration-sqlite (remoteapi_features, 8.2, main)	1m 4s
integration-sqlite (setup_features, 8.2, main)	6m 3s
integration-sqlite (sharees_features, 8.2, main)	9m 24s
integration-sqlite (sharing_features, 8.2, main)	22m 21s
integration-sqlite (videoverification_features, 8.2, main)	10m 9s
integration-sqlite-summary	4s
	2h 10m 20s

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