[Firebase AI] Handle empty or unknown Part data
#15262
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Code Review
This pull request introduces robust handling for empty or unknown Part data in GenerateContentResponse. For streaming calls, responses with only empty candidates are now skipped, improving the developer experience. For unary calls, an error is thrown only if all candidates in a response are empty. This is a solid improvement that also resolves decoding issues with newer models. The changes are well-structured, and the addition of new tests and updates to existing ones ensure the new logic is covered. I have one minor suggestion to use a more specific log code.
paulb777
approved these changes
Sep 3, 2025
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Added handling for
GenerateContentResponsevalues that contain noparts. When streaming, these are skipped since the developer can't act upon them. In unary calls, throws only if all candidates are empty since, unlike streaming, no additional responses will be returned by the backend (and therefore an empty response would be an error).This PR resolves decoding issues when using the
gemini-2.5-flash-image-preview("nano banana") model with the Gemini Developer API to generate images, as well as hardening the decoding against malformed responses that were being returned by Vertex AI (now fixed in the backend).