Werk #11058: NagVis: Updated to 1.9.20

Component	Other components
Title	NagVis: Updated to 1.9.20
Date	Apr 20, 2020
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 1.6.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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