fix(common): Fix template error when probes are enabled without a valid service

[gabe565]

Description of the change

This is a small change, but when a container has probes enabled with no matching service, a templating error occurs. If the value is checked beforehand, it will result in an error which is much easier to diagnose and fix.

Removed

Fixed

Templating error when an invalid service port is looked up.

Added

Changed

Benefits

Possible drawbacks

Applicable issues

• fixes #293

Additional information

I'm not sure if it's possible to test for different error types, but if so I'd like to add a test for this. Will investigate.

Checklist

• [x] Title of the PR conforms to the Conventional Commits standard.
• [x] Scope of the of the PR title contains the chart name.
• [x] Chart version in Chart.yaml has been bumped according to Semantic Versioning.
• [x] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
• [ ] Variables have been documented in the values.yaml file.

[gabe565]

Ah I thought common-3.0.4 was just a milestone, but it already implemented the fix. Closing this!