fix(core): Always try to generate some kind of preview #17605

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	2m 7s
integration-sqlite (collaboration_features, 8.1, main)	3m 30s
integration-sqlite (comments_features, 8.1, main)	2m 14s
integration-sqlite (dav_features, 8.1, main)	9m 31s
integration-sqlite (features, 8.1, main)	10m 35s
integration-sqlite (federation_features, 8.1, main)	6m 18s
integration-sqlite (--tags ~@large files_features, 8.1, main)	13m 49s
integration-sqlite (filesdrop_features, 8.1, main)	1m 51s
integration-sqlite (file_conversions, 8.1, main)	2m 17s
integration-sqlite (openldap_features, 8.1, main)	1m 32s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 39s
integration-sqlite (ldap_features, 8.1, main)	1m 40s
integration-sqlite (remoteapi_features, 8.1, main)	1m 20s
integration-sqlite (setup_features, 8.1, main)	1m 58s
integration-sqlite (sharees_features, 8.1, main)	4m 37s
integration-sqlite (sharing_features, 8.1, main)	20m 42s
integration-sqlite (videoverification_features, 8.1, main)	4m 5s
integration-sqlite-summary	5s
	1h 29m 56s

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