Werk #4714: Inventory win_networkadapter: Fixed exception when values were missing

Component	HW/SW inventory
Title	Inventory win_networkadapter: Fixed exception when values were missing
Date	Jun 12, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.4.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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