fix(dav): Always respond custom error page on exceptions #10554

Job	Run time
changes	8s
integration-sqlite (capabilities_features, 8.1, main)	1m 8s
integration-sqlite (collaboration_features, 8.1, main)	4m 20s
integration-sqlite (comments_features, 8.1, main)	3m 24s
integration-sqlite (dav_features, 8.1, main)	7m 47s
integration-sqlite (features, 8.1, main)	10m 25s
integration-sqlite (federation_features, 8.1, main)	5m 9s
integration-sqlite (--tags ~@large files_features, 8.1, main)	14m 17s
integration-sqlite (filesdrop_features, 8.1, main)	2m 28s
integration-sqlite (openldap_features, 8.1, main)	1m 6s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 21s
integration-sqlite (ldap_features, 8.1, main)	2m 45s
integration-sqlite (remoteapi_features, 8.1, main)	2m 5s
integration-sqlite (setup_features, 8.1, main)	55s
integration-sqlite (sharees_features, 8.1, main)	5m 25s
integration-sqlite (sharing_features, 8.1, main)	18m 43s
integration-sqlite (videoverification_features, 8.1, main)	6m 26s
integration-sqlite-summary	5s
	1h 28m 57s

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