Box trace with `boxpoints="all"` and `line_width=0` doesn't render marker in legend

When the width of a box trace is set to 0 and boxpoints is set to "all", it seems that the legend still attempts to render the box in the legend, which will never appear because the width is 0. It seems that in this case the marker should appear in the legend instead, as is already the case when the line alpha is 0.

I'd be happy to work on this as well.

import plotly.express as px

df = px.data.tips()

fig = px.strip(df, x="total_bill", y="day", color="time")
new_fig = fig.update_traces(line={"color": None, "width": 0})
new_fig.show()

width 0 かつ boxpoints を "all" に設定した、提供されている box-trace の例を再現し、その後、ボックスの凡例のレンダリングパスを追跡します。line alpha が 0 の場合の既存の動作と比較します。ボックス自体をレンダリングできない場合でもマーカーが凡例に表示されれば完了です。