Werk #2905: Check plugins: Non existant man pages now result in helpful error messages

Component	Setup
Title	Check plugins: Non existant man pages now result in helpful error messages
Date	Jan 20, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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