Werk #4150: Avoid exception in host search when searching for empty texts

Component	Setup
Title	Avoid exception in host search when searching for empty texts
Date	Dec 16, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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