Werk #23051: Backup: no crash on empty S3 bucket

Component	Setup
Title	Backup: no crash on empty S3 bucket
Date	Nov 5, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p19 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Opening the list of backups of an Amazon S3 or S3-compatible backup target failed with "KeyError: 'Contents'" when the bucket was empty.

The list of backups of such a target is now shown as empty.

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