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
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0b2 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

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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