Werk #5992: HW/SW Inventory: Fixed AttributeError if any plugin provides wrong data structure

ComponentGUI
TitleHW/SW Inventory: Fixed AttributeError if any plugin provides wrong data structure
Date2018-04-24 10:35:23
Check_MK EditionCheck_MK Raw Edition (CRE)
Check_MK Version1.6.0i1,1.5.0b2
LevelTrivial Change
ClassBug Fix
CompatibilityCompatible - no manual interaction needed