Weird error message for invalid v4 simulation

[tommysitu]

Importing an invalid v4 simulation could trigger the following error message that is not very helpful.

[tommysitu]

The following simulation triggers a similar error:

{
	"data": {
		"pairs": [
			{
				"request": [],
				"response": []
			
			}
		],
		"globalActions": {
			"delays": []
		}
	},
	"meta": {
		"schemaVersion": "v4"
	}
}