Support for Empty Column in DataGrid

[jubilee2]

Description:

I am trying to use the DataGrid component in the Shiny Express library to display a DataFrame that includes an empty column. However, it seems that the DataGrid does not support empty column names. Below is an example code demonstrating the issue:

import pandas as pd
from shiny.express import render, ui

n = 6
df = pd.DataFrame(
    {
        "": range(n),
        "b": range(n, n * 2),
        "c": range(n * 2, n * 3),
        "d": range(n * 3, n * 4),
        "e": range(n * 4, n * 5),
    }
)

ui.h2("Data Frame with Styles applied to 4 cells")

@render.data_frame
def my_df():
    return render.DataGrid(df)

Current Behavior: The DataGrid fails to render the DataFrame when an empty column name is present.

Expected Behavior: The DataGrid should support DataFrames with empty column names and render them appropriately.

[cpsievert]

I can confirm this is a bug that should get fixed, but FWIW, a workaround is to replace "" with " ".