Werk #7283: background jobs: fixed parsing of broken background job status files

Component	Setup
Title	background jobs: fixed parsing of broken background job status files
Date	Nov 3, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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