Werk #20031: dell_eql_storage: Stop crashing on (partially) empty rows

Component	Checks & agents
Title	dell_eql_storage: Stop crashing on (partially) empty rows
Date	Jun 2, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p32 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The storage device is allowed to send no/empty data, while the plugin expected data. This led to plugin crashes.

With this change, missing data is handled accordingly:

• Missing state information is displayed as "unknown".
• Missing values on storage usage lead to a stale service.

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