Werk #12306: docker_container_cpu: fix 'KeyError (percpu_usage)' crash

Component	Checks & agents
Title	docker_container_cpu: fix 'KeyError (percpu_usage)' crash
Date	Mar 2, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Before this werk, the check could crashed with KeyError (percpu_usage)

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