Werk #14713: graylog_failures: Fix crash with JSONDecodeError

Component Checks & agents
Title <tt>graylog_failures</tt>: Fix crash with <tt>JSONDecodeError</tt>
Date Aug 8, 2022
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.2.0b1 2.1.0p10 2.0.0p28
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Depending on the failures reported by the Graylog API, the check plugin graylog_failures crashed with

JSONDecodeError (Expecting value: line 1 column 1 (char 0))

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