Edited Session Message as Importer Error messages

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

@@ -130,7 +130,7 @@ public class App extends Application
 			fileIn.close();
 		}catch(IOException e){
 			session = new Session();
-			e.printStackTrace();
+			System.out.println("New Session File Created");
 		}catch(ClassNotFoundException e){
 			System.out.println("Missing Session Class");
 			System.exit(1);

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

@@ -26,6 +26,7 @@ public class Importer{
                 "Text & .csv", "*.txt", "*.csv");
         chooser.getExtensionFilters().add(filter);
         File file = chooser.showOpenDialog(primaryStage);
+        if (file != null) {
             if (scene == SceneCode.AIRLINE_RAW_DATA) {
                 try {
                     showSuccessAlert(parent.getCurrentDataset().importAirline(file.getPath()));
@@ -51,7 +52,7 @@ public class Importer{
                     e.printStackTrace();
                 }
             }
-
+        }
     }
 
     public void showSuccessAlert(String message){