Werk #4746: Fixed using HW/SW inventory filters in views without inventory painters

Component	User interface
Title	Fixed using HW/SW inventory filters in views without inventory painters
Date	May 23, 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) 1.4.0 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When adding a HW/SW inventory related filter to a view without adding a sorter or painter, this resulted in a KeyError exception.

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