Empty row responses break infinite row model grids #443

import numpy as np
import pandas as pd
from dash import Dash, Input, Output, callback, ctx, html
from dash_ag_grid import AgGrid

data = df = pd.DataFrame(
    {
        "id": range(1000),
        "value": np.random.rand(1000),
    }
)

clear_button = html.Button("Clear", id="clear")
reset_button = html.Button("Reset")

grid = AgGrid(
    columnDefs=[
        {"field": "id"},
        {"field": "value"},
    ],
    getRowId="params.data.id",
    rowModelType="infinite",
)


@callback(
    Output(grid, "getRowsResponse"),
    Input(grid, "getRowsRequest"),
    Input(clear_button, "n_clicks"),
    Input(reset_button, "n_clicks"),
    prevent_initial_call=True,
)
def update_rfq_grid_rows(
    request,
    n_clicks_clear,
    n_clicks_reset,
):
    if ctx.triggered_id == "clear":
        response = {
            "rowData": [],
            "rowCount": 0,
        }
        print(response)
        return response

    if request is None:
        partial_df = data.head(100)
    else:
        partial_df = data.iloc[request["startRow"] : request["endRow"]]

    response = {
        "rowData": partial_df.to_dict("records"),
        "rowCount": len(data.index),
    }
    print(response)
    return response


app = Dash()
app.layout = html.Div(
    children=[
        clear_button,
        reset_button,
        grid,
    ]
)

if __name__ == "__main__":
    app.run(debug=True)