[stable30] fix: Don't crash if disabled user is missing in the database #11798

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.1, stable30)	1m 1s
integration-sqlite (collaboration_features, 8.1, stable30)	3m 14s
integration-sqlite (comments_features, 8.1, stable30)	1m 19s
integration-sqlite (dav_features, 8.1, stable30)	9m 5s
integration-sqlite (features, 8.1, stable30)	11m 38s
integration-sqlite (federation_features, 8.1, stable30)	6m 21s
integration-sqlite (--tags ~@large files_features, 8.1, stable30)	7m 42s
integration-sqlite (filesdrop_features, 8.1, stable30)	2m 20s
integration-sqlite (openldap_features, 8.1, stable30)	2m 19s
integration-sqlite (openldap_numerical_features, 8.1, stable30)	2m 20s
integration-sqlite (ldap_features, 8.1, stable30)	1m 13s
integration-sqlite (remoteapi_features, 8.1, stable30)	2m 22s
integration-sqlite (setup_features, 8.1, stable30)	47s
integration-sqlite (sharees_features, 8.1, stable30)	4m 5s
integration-sqlite (sharing_features, 8.1, stable30)	17m 54s
integration-sqlite (videoverification_features, 8.1, stable30)	7m 20s
integration-sqlite-summary	5s
	1h 21m 12s

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