Werk #12651: nimble_latency: do not discover if no data

Component	Checks & agents
Title	nimble_latency: do not discover if no data
Date	Apr 14, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The service discovery for nimble devices will no longer discover any services if a valid vol_name exists but the associated data is empty.

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