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Werk #11904: Fix TypeError in docker_container_diskstat check

Component Checks & agents
Title Fix TypeError in docker_container_diskstat check
Date Feb 9, 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
2.0.0b7 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
1.6.0p21 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This fixes the TypeError ('NoneType' object is not iterable) error in the docker_container_diskstat check.

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