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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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