[
	{
		"type": "ExternalData",
		"service": "geoshape",
		"query": "foo"
	},
	{
		"type": "FeatureCollection",
		"features": [
			{
				"type": "ExternalData",
				"service": "geoshape",
				"query": "foo"
			}
		]
	}
]
Add test that verifies ExternalData can be only top-level
Add test that verifies ExternalData can be only top-level

Bug: T145845
Change-Id: I130a83d456427b17d4160224bbec80a4c46b3806
