fix(client): A2ACardResolver.get_agent_card will auto-populate with agent_card_path when relative_card_path is empty

[holtskinner]

• Previously, it would only override with the default path when relative_card_path is None
• Developer Experience Improvement when urlparse or similar libraries are used.

[gemini-code-assist]

Summary of Changes

Hello @holtskinner, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the logic within the A2ACardResolver to handle cases where a relative card path might be provided as an empty string rather than None. By adjusting the conditional check, the system will now consistently fall back to the default agent_card_path in both None and empty string scenarios, leading to more robust and predictable behavior for developers integrating with the client.

Highlights

• Improved get_agent_card logic: The A2ACardResolver.get_agent_card method now correctly defaults to agent_card_path when relative_card_path is an empty string, not just None.
• Enhanced Developer Experience: This change improves developer experience, especially when urlparse or similar libraries might return an empty string instead of None for an absent path.

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[gemini-code-assist]

Code Review

This pull request improves the get_agent_card method in A2ACardResolver by changing the condition that checks for relative_card_path. The switch from is None to not relative_card_path allows the method to correctly fall back to the default agent_card_path when relative_card_path is an empty string, in addition to None. This is a good developer experience improvement, as it makes the function more robust, especially when used with URL parsing libraries that might return an empty string for a missing path. The change is idiomatic and enhances the predictability of the method.