Werk #4705: Fixed broken flexible notifications configuration

Component	Setup
Title	Fixed broken flexible notifications configuration
Date	Jun 2, 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

The user configuration page no longer raises an exception upon Save when flexible notifications are enabled.

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