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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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