Reset textbox value to empty string when value is None

[hannahblair]

Description

When the textbox value is cleared, it's set to None on the backend. When the value is set to None in the backend, this PR adds a func set it to "" in the frontend.

Closes: #5103

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Tests

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Name	Status	Preview	Updated (UTC)
gradio	✅ Ready (Inspect)	Visit Preview	Aug 7, 2023 0:43am

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/textbox	patch
gradio	patch

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Reset textbox value to empty string when value is None

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[gradio-pr-bot]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-5114-all-demos

---

You can install the changes in this PR by running:

pip install https://gradio-builds.s3.amazonaws.com/efec49f6d6e0248539d51ed9b12b0bea12b23c28/gradio-3.39.0-py3-none-any.whl

[freddyaboulton]

Thanks for the quick fix @hannahblair !