Werk #2631: janitza_umg_freq: fixed crash when no frequency measurements were reported by the device

Component	Checks & agents
Title	janitza_umg_freq: fixed crash when no frequency measurements were reported by the device
Date	Sep 24, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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