fmt_nanoplot invalid plot_type="bars" does not error, produces no plot

[machow]

fmt_nanoplot can accept plot_type="bar", but if you accidentally pass "bars" then

1. it does not error
2. it does not produce any plots

It seems like this should raise an error

import polars as pl

df = pl.DataFrame({"x": [[1, 2, 3], [4, 5]]})
GT(df).fmt_nanoplot("x", plot_type="bars")