Werk #14713: graylog_failures: Fix crash with JSONDecodeError

Component	Checks & agents
Title	graylog_failures: Fix crash with JSONDecodeError
Date	Aug 8, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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