Make exceptions in the Client more specific

[abidlabs]

Previously, If an exception was raised in the upstream app due to an invalid value provided by the Python Client, then the error that is raised is not very informative:

ValueError: None

My initial thought was to transmit the error from the server to the client to provide better error messages. However, we intentionally do not reveal exceptions to users of Gradio applications as they can reveal security vulnerabilities, unless show_error=True.

So this PR only prints the upstream exception if show_error=True, otherwise prints a generic error explaining how to print more detailed errors. For other types of errors that the Client can generate, e.g. when an invalid parameter is provided, it changes the errors to be TypeError instead of ValueError -- that's consistent with the error type that is raised when you call a function in Python with the wrong parameters.

Closes: https://github.com/gradio-app/gradio/issues/7889

[gradio-pr-bot]

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/8d91c14aa50754fca4fceb1f8f9582923a3523f0/gradio-4.31.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@8d91c14aa50754fca4fceb1f8f9582923a3523f0#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
gradio	patch
gradio_client	patch

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

With the following changelog entry.

Make exceptions in the Client more specific

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[abidlabs]

Thanks @freddyaboulton for the review!