Werk #5423: Fixed exception on "Catalog of check plugins page"

Component	Setup
Title	Fixed exception on "Catalog of check plugins page"
Date	Oct 27, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0p17 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The exception was caused by man pages having an empty "catalog:" header declaration.

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