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
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b9 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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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