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Werk #11614: Fix crash when configuring icon visibility of custom icons

Component Setup
Title Fix crash when configuring icon visibility of custom icons
Date Dec 1, 2020
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Checkmk versions & editions
2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT
2.0.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

When configuring the icon visibility using the global setting "Custom icons and actions" of custom icons "Builtin icon visibility" the exception "AttributeError (type object 'CustomIconHttp' has no attribute '_title')" could occur.

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