[BUG]: Repository JSON null but Config YAML not

[actuarysailor]

Describe the bug
If the Config settings are not null, but the settings in the YAML are you get errors when it tries to reference values in the repo settings.

To Reproduce
Steps to reproduce the behavior:

1. Set all your PR Options in a repo to none - remove all status checks, overrides, etc.
2. Configure Settings.YAML to populate status checks and who can close / override pull request options etc.
3. Run the action'
4. See error

Expected behavior
It should show them as a difference rather than throwing an error because a dictionary key is missing.

Screenshots
Sorry, didn't take any, but provided steps to reproduce.

Desktop (please complete the following information):

• OS: Win10
• Browser Edge
• Version 101.0.1210.39 (Official build) (64-bit)

Additional context
Came across it when I was testing the PR for status checks. That PR has this fixed.
Fixed in #28

[andrewthetechie]

Will be released in #26