Safely Access Dictionary Key in Logging Output

[mcdonnnj]

🗣 Description

This changes a dictionary access to use the get() method so a default value is returned if the key is missing.

💭 Motivation and context

GitHub Actions runs for the lineage_scan workflow are currently failing because cisagov/con-pca-api is missing the version field in its .github/lineage.yml file and we do not safely access that key in the parsed configuration dictionary. This can be seen at this point in the log. Although that repository needs to be fixed, it should not result in a failing state for this Action.

🧪 Testing

Automated tests pass.

✅ Checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.

[jsf9k]

Nice catch!

[dav3r]

Nice catch 🦅 👀