Werk #7343: Fixed broken Dokuwiki CSS with newer PHP versions

Component	Other components
Title	Fixed broken Dokuwiki CSS with newer PHP versions
Date	May 1, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p17 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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