[Python] Fix InternalException from scanning Polars DF with no columns #11982
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pdet
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Merge pull request duckdb/duckdb#11982 from Tishj/python_empty_polars_df
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This PR fixes #11946
We were not checking that the dataframe produced at least one column, this failed later on with an InternalException.
Now it throws an InvalidInputException, similar to the behavior of scanning a pandas dataframe that has no columns.