Werk #5933: HW/SW inventory: Fixed AttributeError

Component	HW/SW inventory
Title	HW/SW inventory: Fixed AttributeError
Date	Mar 29, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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