Werk #3961: fixed error sections handling if parse function is available

Component	Checks & agents
Title	fixed error sections handling if parse function is available
Date	Oct 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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