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When a `hash_part_table` has no secondary attributes, this line breaks since `rows_to_hash.to_dict(orient='records')` will return `[]` instead of `[{}]`.

on May 10, 2022

When a `hash_part_table` has no secondary attributes, this line breaks since `rows_to_hash.to_dict(orient='records')` will return `[]` instead of `[{}]`.