fix: command lookup error when scope is cached

[sondevra]

Fixed lookup to use .get() on the dictionary to prevent large log of error in the circumstance of a cache command showing on a changed scope

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

Fixed lookup to use .get() on the dictionary to prevent large log of error in the circumstance of a cache command showing on a changed scope.

What happens is when no commands have been loaded to a Discord guild's scope, but they are cached, if a user tries to request one of these cached commands, an error occurs because of the way the lookup was handled (index notation)

Changes

• Changed index notation to .get() on the dictionary.

Related Issues

Test Scenarios

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable

[sondevra]

@AstreaTSS need your help adding reviewers.

[AstreaTSS]

Reviewers don't need to be manually added - the contributors of interactions.py will see this and review whenever they can on their own.