Werk #7650: NagVis: Updated to 1.9b19

Component	Other components
Title	NagVis: Updated to 1.9b19
Date	May 22, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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