Werk #6836: Fix Docker crashes

Component Checks & agents
Title Fix Docker crashes
Date Nov 5, 2018
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.5.0p8 1.6.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Work around missing 'Repository' key if Repository Tags are not defined in image inspect output. Work around missing values if values are zero in 'docker system df'. Do not crash upon empty section in case of missing permissions.

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