Werk #4324: Fixed possible exception when saving user with special characters in user name

Component	Setup
Title	Fixed possible exception when saving user with special characters in user name
Date	Feb 6, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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