Werk #16517: Gracefully handle rrdcached errors

Component	Livestatus
Title	Gracefully handle rrdcached errors
Date	Aug 8, 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 Cloud, Checkmk Ultimate MT 2.4.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Unexpected values from the rrdcached could lead to crashes of the cmc or of the neb.

Such errors are now logged instead.

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