Added Cannot delte if the flight path only has 2 points

src/main/java/seng202/group9/Controller/Dataset.java

@@ -2,6 +2,7 @@ package seng202.group9.Controller;
 
 
 import javafx.scene.chart.PieChart;
+import javafx.scene.control.Alert;
 import seng202.group9.Core.*;
 
 import java.sql.Connection;
@@ -1160,7 +1161,7 @@ public class Dataset {
         flightPathDictionary.put(pathID, newPath);
         flightPaths.add(newPath);
         FlightPoint sourcePoint = new FlightPoint(sourceAirport, pathID);
-        FlightPoint destinationPoint = new FlightPoint(sourceAirport, pathID);
+        FlightPoint destinationPoint = new FlightPoint(destAirport, pathID);
         try{
             addFlightPointToPath(sourcePoint);
             addFlightPointToPath(destinationPoint);
@@ -1591,6 +1592,7 @@ public class Dataset {
      * @param flightPoint
      */
     public void deleteFlightPoint(FlightPoint flightPoint, FlightPath flightPath){
+        if (flightPath.getFlightPoints().size() > 2){
             //drop the tables
             Connection c = null;
             Statement stmt = null;
@@ -1618,6 +1620,13 @@ public class Dataset {
             flightPointDictionary.remove(flightPoint);
             updateFlightPointInfo(flightPath);
             updateFlightPath(flightPath);
+        }else{
+            Alert cannotDelete = new Alert(Alert.AlertType.ERROR);
+            cannotDelete.setTitle("Flight Path Error");
+            cannotDelete.setHeaderText("Cannot Delete Flight Point.");
+            cannotDelete.setContentText("You cannot have less than 2 Points in a Flight Path.");
+            cannotDelete.showAndWait();
+        }
     }
 
     /**