[Firebase AI] Handle a response with no Parts

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Handle if the backend sends a response with no parts in it, which can happen in some edge cases. Also, slightly reword a test to be more reliable.

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Testing

Describe how you've tested these changes.

Running locally.

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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[gemini-code-assist]

Summary of Changes

Hello @a-maurice, 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 enhances the robustness of the Firebase AI client by addressing an edge case where the backend might send a response without any content 'parts', preventing potential null reference exceptions. Additionally, it includes a minor refinement to an existing test prompt within the sample application to improve its reliability.

Highlights

• Error Handling: Implemented a null-conditional operator when parsing content parts to gracefully handle responses from the backend that may not contain any 'parts', preventing potential runtime errors.
• Test Reliability: Modified a test prompt in the sample application to be more reliable and robust, ensuring consistent test outcomes.

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[gemini-code-assist]

Code Review

This pull request correctly handles an edge case where a response from the backend might not contain any 'parts', preventing a potential null reference exception. The change in ModelContent.cs is appropriate and effective. The rewording of the test prompt in UIHandlerAutomated.cs is also a reasonable change to improve test reliability. The changes look good and improve the robustness of the code.