Checkmk Werk 13663: Fix JSONDecodeError on crash reports view

ID: 13663 Title: Fix JSONDecodeError on crash reports view Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If a crash report was created but the crash info key was missing inside the file within ~/var/check_mk/crashes/CRASH_ID/crash.info, the crash report view showed an error like "json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)".