Fix add_document behaviour with empty string

[adripo]

Pull Request

Related issue

Fixes #585

What does this PR do?

• Receive a formal message for this case from Meilisearch API.
• Test correct functionality

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[alallema]

Thanks, @adripo for this PR!
I made a few suggestions.
Don't hesitate to check the contribution I think you had some linting issues

[adripo]

Thanks @alallema. I followed your suggestions and fixed the lint issues.

[adripo]

@alallema can you please run the checks on my pr please?

[alallema]

Thanks, @adripo for this PR!
LGTM! 🎉
Thanks again for contributing with Meilisearch ❤️
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[alallema]

bors merge

[bors]

Build succeeded:

• integration-tests (3.10)
• integration-tests (3.11)
• integration-tests (3.7)
• integration-tests (3.8)
• integration-tests (3.9)
• mypy
• pylint