If I pass in use a non-existent start or end location to
DirectionsService, I don't get a blank result set as expected.

How do I get the service to return to me either ZERO_RESULTS or
INVALID_REQUEST? I am always getting 'OK'.

var dirSvc = new google.maps.DirectionsService();

var request = {
        origin: anInvalidLocation, // I used 'nowhereville, OR
        destination: aValidCityState, // Using New York, New York
        travelMode: google.maps.DirectionsTravelMode.DRIVING

dirSvc.route(request, function(result, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      // result is always non-empty
    }

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