Ensure gradio client works as expected for functions that return nothing. (#5173)
* fixed issue with the js client expecting optional api_info from python gradio runner
* add changeset
* add changeset
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Co-authored-by: pngwn <hello@pngwn.io>
Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>