[2.3.0] Checkmk Werk 16801 adapted: Custom graphs: Fix crash in case of unavailable scalars

Werk 16801 was adapted. The following is the new Werk, a diff is shown at the end of the message. [//]: # (werk v2) # Custom graphs: Fix crash in case of unavailable scalars key | value ---------- | --- date | 2024-04-23T10:22:44+00:00 version | 2.3.0 class | fix edition | cee component | metrics level | 1 compatible | yes When adding a scalar to a custom graph, it is possible that no value is available for this scalar. For example, this is the case when adding the CRIT threshold of a metric for which no thresholds are configured. In such cases, no graph was rendered. Instead, the Checkmk UI displayed the message "Cannot calculate graph recipes" and showed a traceback. This werk restores the correct behavior: No lines are rendered for unavailable scalars and they are denoted with "n/a" in the graph legend. ------------------------------------<diff>------------------------------------------- [//]: # (werk v2) # Custom graphs: Fix crash in case of unavailable scalars key | value ---------- | --- date | 2024-04-23T10:22:44+00:00 - version | 2.3.0b7 ? -- + version | 2.3.0 class | fix edition | cee component | metrics level | 1 compatible | yes When adding a scalar to a custom graph, it is possible that no value is available for this scalar. For example, this is the case when adding the CRIT threshold of a metric for which no thresholds are configured. In such cases, no graph was rendered. Instead, the Checkmk UI displayed the message "Cannot calculate graph recipes" and showed a traceback. This werk restores the correct behavior: No lines are rendered for unavailable scalars and they are denoted with "n/a" in the graph legend.