Concatenating to a list column using another column throws PanicException with empty DataFrame

[bkos]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

df = pl.DataFrame(schema={'a': pl.Int16, 'b': pl.List(pl.String)})

# Works
df.with_columns(pl.col('b').list.concat([1]))

# Breaks
df.with_columns(pl.col('b').list.concat([pl.col('a').cast(pl.String)]))

Log output

PanicException: called `Result::unwrap()` on an `Err` value: ComputeError(ErrString("cannot reshape len 0 into shape [-1, 1]"))

Issue description

Concatenating to a list column using another column throws PanicException with empty DataFrame

Expected behavior

To return empty DataFrame

Installed versions

--------Version info---------
Polars:               0.20.31
Index type:           UInt32
Platform:             Windows-10
Python:               3.11.7

[Object905]

Can reproduce. It was working on earlier versions, but after upgrading to 1.2 it's still there