getEmptyStopIndex
Finds the index of the first empty stop in the itinerary list.
Return
Index of the first empty stop, or -1 if none is found.
Parameters
items
List of itinerary items to search.
Finds the index of the first empty stop in the itinerary list.
Index of the first empty stop, or -1 if none is found.
List of itinerary items to search.