Werk #3216: Fixed exception when trying to edit an already deleted user

Component	Setup
Title	Fixed exception when trying to edit an already deleted user
Date	Feb 16, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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