Fix unwanted exception on Delete Flight Order Management API

[tsolakoua]

The Flight Orders Management API returns en empty body with status code 204 when an order is deleted successfully. The SDK doesn't handle this use case properly; it throws a ParserException as the API does not return a FlightOrder object, instead returns the empty response with code 204.

How to reproduce

import com.amadeus.Amadeus;
import com.amadeus.booking.FlightOrder;
import com.amadeus.exceptions.ResponseException;

public class FlightOrderManagement {
    public static void main(String[] args)  throws ResponseException {
      Amadeus amadeus = Amadeus
              .builder("client_key","client_secret")
              .build();
      com.amadeus.resources.FlightOrder order = amadeus.booking.flightOrder("eJzTd9cP8A8y8nIDAAtUAlk").delete();

      if (order.getResponse().getStatusCode() != 204) {
        System.out.println("Wrong status code: " + order.getResponse().getStatusCode());
        System.exit(-1);
      }

      System.out.println("deleted");
     }
}

Exception in thread "main" com.amadeus.exceptions.ParserException: [204]
        at com.amadeus.Response.detectError(Response.java:79)
        at com.amadeus.HTTPClient.execute(HTTPClient.java:361)
        at com.amadeus.HTTPClient.unauthenticatedRequest(HTTPClient.java:253)
        at com.amadeus.HTTPClient.request(HTTPClient.java:339)
        at com.amadeus.HTTPClient.delete(HTTPClient.java:94)
        at com.amadeus.booking.FlightOrder.delete(FlightOrder.java:85)
        at com.amadeus.booking.FlightOrder.delete(FlightOrder.java:95)
        at flightsearch.FlightSearch.main(FlightSearch.java:17)