Werk #10263: NagVis: Updated to 1.9.15

Component	Other components
Title	NagVis: Updated to 1.9.15
Date	Oct 16, 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 1.6.0p5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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