Werk #11251: NagVis: Updated to 1.9.21

Component	Other components
Title	NagVis: Updated to 1.9.21
Date	Jul 15, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p14 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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