Werk #19315: Custom graphs: Fix transformation during update, ie. 'TypeError(parameters)'

Component	Metrics system
Title	Custom graphs: Fix transformation during update, ie. 'TypeError(parameters)'
Date	Feb 23, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0p43 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

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