[stable30] fix: don't try to get fileid for non exising nodes when serializing events file #26506

Job	Run time
changes	12s
integration-sqlite (collaboration_features, 8.1, stable30)	3m 43s
integration-sqlite (capabilities_features, 8.1, stable30)	1m 55s
integration-sqlite (comments_features, 8.1, stable30)	2m 51s
integration-sqlite (features, 8.1, stable30)	9m 55s
integration-sqlite (remoteapi_features, 8.1, stable30)	1m 28s
integration-sqlite (federation_features, 8.1, stable30)	4m 30s
integration-sqlite (openldap_features, 8.1, stable30)	2m 20s
integration-sqlite (dav_features, 8.1, stable30)	8m 31s
integration-sqlite (ldap_features, 8.1, stable30)	2m 4s
integration-sqlite (sharees_features, 8.1, stable30)	4m 43s
integration-sqlite (--tags ~@large files_features, 8.1, stable30)	9m 31s
integration-sqlite (setup_features, 8.1, stable30)	2m 4s
integration-sqlite (filesdrop_features, 8.1, stable30)	2m 21s
integration-sqlite (sharing_features, 8.1, stable30)	19m 31s
integration-sqlite (openldap_numerical_features, 8.1, stable30)	1m 40s
integration-sqlite (videoverification_features, 8.1, stable30)	6m 1s
integration-sqlite-summary	6s
	1h 23m 26s

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