Werk #8916: Fix HTML link parser

Component	Setup
Title	Fix HTML link parser
Date	Sep 17, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The HTML links from the context help texts were not always parsed correctly. This fixes the parser.

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