[2.3.0] Checkmk Werk 17225 created: Custom graphs: Respect "Metrics with all zero values" setting

[//]: # (werk v2) # Custom graphs: Respect "Metrics with all zero values" setting key | value ---------- | --- date | 2024-08-05T06:51:13+00:00 version | 2.3.0p13 class | fix edition | cee component | multisite level | 1 compatible | yes The custom graph setting _Metrics with all zero values_ was not persisted and not taken into account when rendering the graph.