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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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