[stable31] fix: don't try to get fileid for non exising nodes when serializing events file #26576

Job	Run time
changes	8s
integration-sqlite (dav_features, 8.1, stable31, stable31)	9m 4s
integration-sqlite (comments_features, 8.1, stable31, stable31)	1m 30s
integration-sqlite (features, 8.1, stable31, stable31)	6m 39s
integration-sqlite (capabilities_features, 8.1, stable31, stable31)	2m 27s
integration-sqlite (openldap_features, 8.1, stable31, stable31)	2m 35s
integration-sqlite (--tags ~@large files_features, 8.1, stable31, stable31)	17m 49s
integration-sqlite (file_conversions, 8.1, stable31, stable31)	2m 11s
integration-sqlite (remoteapi_features, 8.1, stable31, stable31)	1m 5s
integration-sqlite (sharees_features, 8.1, stable31, stable31)	2m 48s
integration-sqlite (collaboration_features, 8.1, stable31, stable31)	3m 17s
integration-sqlite (ldap_features, 8.1, stable31, stable31)	2m 43s
integration-sqlite (sharing_features, 8.1, stable31, stable31)	12m 32s
integration-sqlite (openldap_numerical_features, 8.1, stable31, stable31)	1m 52s
integration-sqlite (videoverification_features, 8.1, stable31, stable31)	5m 48s
integration-sqlite (setup_features, 8.1, stable31, stable31)	2m 14s
integration-sqlite (filesdrop_features, 8.1, stable31, stable31)	1m 43s
integration-sqlite (federation_features, 8.1, stable31, stable31)	5m 38s
integration-sqlite-summary	6s
	1h 22m 9s

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