Werk #15739: fortisandbox_disk_usage: Fix KeyError: 'disk_used'

Component	Checks & agents
Title	fortisandbox_disk_usage: Fix KeyError: 'disk_used'
Date	May 12, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The above mentioned check plugin always crashed with

KeyError: 'disk_used'

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