Werk #17794: redfish: Correctly handle HPE devices without manager in data

Component	Checks & agents
Title	redfish: Correctly handle HPE devices without manager in data
Date	Apr 16, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0b6 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

This werk handles the case when a HPE device has not Manager in the queried data.

Thanks to Andreas Döhler for the contribution.

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