Fixed bug with flight pages and an empty dataset

src/main/java/seng202/group9/GUI/FlightRDController.java

@@ -115,6 +115,7 @@ public class FlightRDController extends Controller {
      * Used to load the table for the Flight points initially from the MenuController
      */
     public void load() {
+        if (theDataSet != null) {
             theDataSet = getParent().getCurrentDataset();
             try {
                 currentPathId = theDataSet.getFlightPaths().get(0).getID(); //Sets the default to the 1st Path
@@ -136,6 +137,7 @@ public class FlightRDController extends Controller {
             ArrayList<FlightPoint> flightPoints = flightPaths.get(0).getFlight();
             flightTableView.setItems(FXCollections.observableArrayList(flightPoints));
         }
+    }
 
     /**
      *  Will take the inputs from the text fields and adds the point to the current flight path.
@@ -318,7 +320,9 @@ public class FlightRDController extends Controller {
 
     @Override
     public void loadOnce(){
+        if (theDataSet != null) {
             flightPathListView();
         }
+    }
 
 }

src/main/java/seng202/group9/GUI/FlightSummaryController.java

@@ -177,6 +177,7 @@ public class FlightSummaryController extends Controller {
      * Used to load the page from the MenuController.
      */
     public void load() {
+        if (theDataSet != null) {
             try {
                 theDataSet = getParent().getCurrentDataset();
                 ArrayList<FlightPath> flightPaths;
@@ -190,7 +191,6 @@ public class FlightSummaryController extends Controller {
                 }
                 flightPathListView.setItems(flightList);
                 flightSummaryListView();
-
             } catch (Exception e) {
                 e.printStackTrace();
             }
@@ -208,6 +208,7 @@ public class FlightSummaryController extends Controller {
                 }
             });
         }
+    }
     /**
      *  Removes the selected path from the list view of paths and from the database.
      */