Grapher: Can't link to charts with an empty selection

[sophiamersmann]

Description

Linking to a chart with a default selection (like https://ourworldindata.org/grapher/life-expectancy?country=) doesn't work anymore. It shows the default selection instead.

Expected behaviour

Linking to a chart with an empty selection should work

Steps to reproduce

1. Go to https://ourworldindata.org/grapher/life-expectancy
2. Remove all countries from the selection
3. Refresh

Additional context

Marcel looked at the code and the problem seems to be here:

owid-grapher/packages/@ourworldindata/grapher/src/core/Grapher.tsx

Lines 1215 to 1219 in dca43cb

	if (this.manager?.selection?.hasSelection) {
	// Selection is managed externally, do nothing.
	} else if (this.selection.hasSelection) {
	// User has changed the selection, use theris
	} else this.applyOriginalSelectionAsAuthored()

[marcelgerber]

Won't fix this one for now, we might come back to this if it bothers me or sophia :)