Werk #4395: Inventory filters: Fixed error handling when entering invalid regexes

Component	HW/SW inventory
Title	Inventory filters: Fixed error handling when entering invalid regexes
Date	Feb 24, 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

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