Hamish Scott

Results 2 issues of Hamish Scott

Reopening [this](https://github.com/pola-rs/polars/pull/13539). Fix #13537 Fixes SplitFields not returning an empty field from a CSV line. I.e. a line like this `a,b,` would yield `["a", "b"]` rather than `["a", "b", ""]`....

fix

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bug
rust