cols_*() methods do not raise if a list of column names not all in data

[machow]

The cols_*() methods raise if a single column name is passed that is not in the data. However, they do not raise if that missing name is in a list.

Here's a reprex

# %%
import pandas as pd                                                                                                                                                       
import great_tables as gt                                                                                                                                                 
                                                                                                                                                                          
df = pd.DataFrame({"A": [1], "B": [2]})                                                                                                                                   
t = gt.GT(df)                                                                                                                                                             
                                                                                                                                                                          
# String input → raises error                                                                                                                                             
# t.cols_align(columns="NOPE")           # AssertionError
# t.cols_label_with(columns="NOPE", fn=str.lower)  # AssertionError

# List input → silently ignores "NOPE"
t.cols_align(columns=["A", "NOPE"])              # no error, only A aligned
t.cols_label_with(columns=["A", "NOPE"], fn=str.lower)  # no error, only A relabeled
t.cols_hide(columns=["A", "NOPE"])               # no error, only A hidden
t.cols_move(columns=["A", "NOPE"], after="A")               # no error, only A moved
t.cols_move_to_start(columns=["A", "NOPE"])      # no error
t.cols_move_to_end(columns=["A", "NOPE"])        # no error