Refactor 404 handling

[decyjphr]

This pull request makes small improvements to the Archive plugin by simplifying error handling and making the code more robust when accessing repository properties.

[Copilot]

Pull Request Overview

This PR refactors error handling in the Archive plugin by simplifying 404 error handling logic and adding optional chaining for safer repository property access.

• Simplifies 404 error handling by removing the additional condition check
• Adds optional chaining (?.) when accessing repository properties to prevent potential null/undefined errors

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[Copilot]

Removing the !this.getDesiredArchiveState() condition changes the behavior for 404 errors. This now returns null for all 404 errors regardless of the desired archive state, which may not be the intended behavior. Consider documenting why this condition was removed or verify this change doesn't break existing functionality.

Suggested change

	return null
	if (!this.getDesiredArchiveState()) {
	return null
	}

[decyjphr]

When the repo is not existing, whether to archive or unArchive doesn't make much of a difference. We cannot throw an Error and stop further processing.