Werk #4450: quicksearch: fixed exception when using special characters

Component	User interface
Title	quicksearch: fixed exception when using special characters
Date	Feb 28, 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 1.4.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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