Werk #4685: Fixed exception when trying to reset a global setting twice

Component	Setup
Title	Fixed exception when trying to reset a global setting twice
Date	May 16, 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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