Werk #11767: job: Crash upon certain killed jobs

Component	Checks & agents
Title	job: Crash upon certain killed jobs
Date	Dec 2, 2020
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 2.0.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The jobs plugin crashed with a key error if jobs were killed in a very specific moment.

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