Werk #7918: nimble_latency: Do not crash and do not discover if required values are missing

Component	Checks & agents
Title	nimble_latency: Do not crash and do not discover if required values are missing
Date	Jul 10, 2019
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)

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