Werk #8940: mbg_lantime_ng_refclock: Fixed crash if field strength cannot be calculated

Component	Checks & agents
Title	mbg_lantime_ng_refclock: Fixed crash if field strength cannot be calculated
Date	Aug 22, 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 1.6.0b7 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p22 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If mbgLtNgRefclockMaxStatusB (MBG-SNMP-LTNG-MIB) is zero the service crashed with a ZeroDivisionError while calculating field strength.

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