Werk #15762: tsm_scratch: Fetch tsm scratch correctly if there are no free tapes

Component	Agent bakery
Title	tsm_scratch: Fetch tsm scratch correctly if there are no free tapes
Date	Jun 16, 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)

Previously, fetching Tivoli Storage Manager (TSM) scratch crashed if there were no free tapes. It resulted with a service becoming UNKNOWN.

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