Werk #2578: Fix exception in case a user has a non-existant role

Component	User interface
Title	Fix exception in case a user has a non-existant role
Date	Sep 3, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Such a situation might be caused by manual configurations or other non-standard operation.

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