Werk #4568: mk_inventory.vbs: fixed getNetworkAdpater function to prevent errors caused by null arrays

Component	HW/SW inventory
Title	mk_inventory.vbs: fixed getNetworkAdpater function to prevent errors caused by null arrays
Date	May 23, 2017
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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