Werk #3461: Fixed exception in case manpage for non existant check is accessed

Component	Setup
Title	Fixed exception in case manpage for non existant check is accessed
Date	May 3, 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

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