Werk #11015: Fixed renaming of roles

Component	User interface
Title	Fixed renaming of roles
Date	Apr 2, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If a role was renamed, current users of that rule did not got the new rule. This resulted in a crash, e.g. on the users page. This has been fixed.

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