Werk #6282: docker_container_cpu: Fixed crash in some environments

Component Checks & agents
Title docker_container_cpu: Fixed crash in some environments
Date Jul 2, 2018
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.5.0b8 1.6.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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