Check if action/event exist before checking the name

[KrishnaIyer]

Summary

Check if action/event exist before checking the name. This is a fix for the undefined ref: https://the-things-industries.sentry.io/issues/4654948021

Changes

• Check if the action and event objects exist before checking the name.

Testing

NA. I'm not sure when this gets triggered but the check should be sufficient.

Regressions

I'll check on staging.

Notes for Reviewers

• This seems to me to be a simple code fix but why this callback gets an empty action or event is unclear to me. @PavelJankoski/ @kschiffer

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.