Werk #11493: NagVis: Fix incompatibility with PHP 7.4

Component packages
Title NagVis: Fix incompatibility with PHP 7.4
Date Sep 18, 2020
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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