Werk #10249: Fix type error when listing alert handler rules

Component Setup
Title Fix type error when listing alert handler rules
Date Oct 4, 2019
Checkmk Edition Checkmk Enterprise (CEE)
Checkmk Version 1.6.0p5 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

A "TypeError" exception could occur after creating alert handler rules while trying to render the alert handler rule list.

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