Handle not found errors

[kenyonj]

Return nil when a repository is not found rather than raise an octokit error

PR Overview

This PR updates the repository helper to gracefully handle cases when a repository is not found by returning nil instead of raising an exception.

• Adds a rescue clause for Octokit::NotFound in test/test_helper.rb
• Updates the repository method to assign nil for non-existent repositories

Reviewed Changes

File	Description
test/test_helper.rb	Adds error handling for Octokit::NotFound to return nil in tests

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test/test_helper.rb:91

• Ensure that tests are added to verify that the repository method returns nil when an Octokit::NotFound error is raised, to prevent potential regressions in error handling.

rescue Octokit::NotFound

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