Add 'UK' operator (Unknown) in case of mussing operator

src/vstp/parser.go

@@ -49,6 +49,9 @@ func formatData(dataInput *upstreamApi.Schedule) database.Service {
 		planSpeed = parseSpeed(dataInput.ScheduleSegment[0].CIFSpeed)
 		stops = parseStops(dataInput.ScheduleSegment[0].ScheduleLocation)
 	}
+	if operator == "" {
+		operator = "UK"
+	}
 	service := database.Service{
 		TransactionType:   dataInput.TransactionType,
 		StpIndicator:      dataInput.CIFSTPIndicator,