Werk #8887: Fix UnicodeDecodeError in complain phase of "Predefined conditions" edit dialog

Component	Setup
Title	Fix UnicodeDecodeError in complain phase of "Predefined conditions" edit dialog
Date	Sep 3, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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