Werk #2740: local: better warning output in case of invalid agent output

Component	Checks & agents
Title	local: better warning output in case of invalid agent output
Date	Nov 6, 2015
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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