Warn against Falsy credentials

[Paillat-dev]

Allowing Falsy auth credentials will cause problems later, for example in hmac.compare_digest(input_password.encode(), correct_password.encode()) as NoneType has no encode method. Moreover, allowing empty passwords would make no sense from a security point of view.

Let me know if any changes are required.

[gradio-pr-bot]

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Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/1c662c46cbc57c150e1ea262b24f537d7b473212/gradio-4.37.2-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@1c662c46cbc57c150e1ea262b24f537d7b473212#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-builds.s3.amazonaws.com/1c662c46cbc57c150e1ea262b24f537d7b473212/gradio-client-1.2.1.tgz

[abidlabs]

Thanks @Paillat-dev I would suggest raising a warning when a none or empty credential is passed in instead of an error -- a lot of times, users are simply prototyping quickly with auth and we don't want to break those workflows

[Paillat-dev]

Sure, I changed it.

[abidlabs]

LGTM @Paillat-dev thanks for the contribution!

[gradio-pr-bot]

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Warn against Falsy credentials

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