Providing Series.str.replace_many with an empty sequence raises an SchemaError

[MarcoStrijker]

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

import polars as pl

_ = pl.Config.set_fmt_str_lengths(100)
s = pl.Series(
    "lyrics",
    [
        "Everybody wants to rule the world",
        "Tell me what you want, what you really really want",
        "Can you feel the love tonight",
    ],
)
s.str.replace_many([], [])

Log output

Traceback (most recent call last):
  File "C:\Program Files\JetBrains\PyCharm Community Edition 2023.2.4\plugins\python-ce\helpers\pydev\pydevconsole.py", line 364, in runcode
    coro = func()
           ^^^^^^
  File "<input>", line 11, in <module>
  File "...\venv\Lib\site-packages\polars\series\utils.py", line 107, in wrapper
    return s.to_frame().select_seq(f(*args, **kwargs)).to_series()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "...\venv\Lib\site-packages\polars\dataframe\frame.py", line 8162, in select_seq
    return self.lazy().select_seq(*exprs, **named_exprs).collect(_eager=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "...\venv\Lib\site-packages\polars\lazyframe\frame.py", line 1816, in collect
    return wrap_df(ldf.collect(callback))
                   ^^^^^^^^^^^^^^^^^^^^^
polars.exceptions.SchemaError: invalid series dtype: expected `String`, got `null`

Issue description

Nothing too serious, but when providing empty input, it raises a SchemaError, which is a bit confusing and inconvient for my use case.

Expected behavior

I guess I would expect a specific error or otherwise a silent pass. I think adding an argument to determine behaviour would be nice.

Installed versions

--------Version info---------
Polars:               0.20.26
Index type:           UInt32
Platform:             Windows-10-10.0.22631-SP0
Python:               3.11.6 (tags/v3.11.6:8b6ee5b, Oct  2 2023, 14:57:12) [MSC v.1935 64 bit (AMD64)]
----Optional dependencies----
adbc_driver_manager:  <not installed>
cloudpickle:          <not installed>
connectorx:           <not installed>
deltalake:            <not installed>
fastexcel:            0.10.4
fsspec:               <not installed>
gevent:               <not installed>
hvplot:               <not installed>
matplotlib:           3.8.3
nest_asyncio:         <not installed>
numpy:                1.26.4
openpyxl:             3.0.10
pandas:               2.0.1
pyarrow:              15.0.2
pydantic:             1.10.14
pyiceberg:            <not installed>
pyxlsb:               <not installed>
sqlalchemy:           <not installed>
torch:                <not installed>
xlsx2csv:             0.8
xlsxwriter:           3.1.9