Werk #10135: mk_docker.py: Do not crash upon removed images

Component	Checks & agents
Title	mk_docker.py: Do not crash upon removed images
Date	Sep 18, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The section docker_container_status was not produced for containers whose image had been removed from the node.

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