Werk #3087: fixed very rare crash in active checks

Component	Checks & agents
Title	fixed very rare crash in active checks
Date	Mar 7, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The error caused active check to go into warning state with output "expected a character buffer object"

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