Werk #7934: local: Fix bug of none existing level values

Component Checks & agents
Title local: Fix bug of none existing level values
Date Aug 21, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b9 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The absence of level values caused local checks to crashed. Now it is possible to set an critical level value without having to set warning level.

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