Werk #14131: KUBE: Handle Pods without QoS class

Component	Checks & agents
Title	KUBE: Handle Pods without QoS class
Date	May 25, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previously, the Kubernetes agent would crash with the error message

[special_kube] Agent exited with code 1: 'NoneType' object has no attribute 'lower'

With this werk, this crash no longer occurs.

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