Werk #4583: netextreme_psu: Fixed empty data handling

Component	Checks & agents
Title	netextreme_psu: Fixed empty data handling
Date	Apr 11, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0b6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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