fix to allow you to add fake selections

[alexcjohnson]

This is useful when you have selectedpoints (based on a different plot perhaps) but no selections, and you still want a doubleclick to clear selectedpoints and generate plotly_selected and plotly_relayout events.

Calling this a bugfix because before this change, an invalid selection object will throw an error here because we convert it to null in the supplyDefaults step:

plotly.js/src/components/selections/defaults.js

Lines 25 to 32 in f6253de

	if(
	selection.x0 === undefined ||
	selection.x1 === undefined ||
	selection.y0 === undefined ||
	selection.y1 === undefined
	) {
	layoutOut.selections[i] = null;
	}

[archmoj]

Nicely done.
💃

[archmoj]

@alexcjohnson could you please rebase it on top of 2.35.2 so that I could release it as part of upcoming 2.35.3?