Werk #18198: Fix crash due to the absent serial_number in agent_netapp_ontap

Component	Checks & agents
Title	Fix crash due to the absent serial_number in agent_netapp_ontap
Date	Jul 18, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Handling of the case when serial_number is not provided has been added.

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