Werk #2926: Fix exception in WATO when a check man page has not catalog entry

Component	Core & setup
Title	Fix exception in WATO when a check man page has not catalog entry
Date	Jan 19, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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