enhance: better error messages and catching for importing army and adding image

src/main/java/edu/ntnu/idatt2001/carljgu/client/App.java

@@ -46,7 +46,8 @@ public class App extends Application {
             String imagePath = Paths.get(currentPath.toString(), "src","main","resources","icons", "wargames-logo.png").toString();
             Image image = new Image(imagePath);
             stage.getIcons().add(image);
-        } catch(IllegalArgumentException e) {
+        } catch(IllegalArgumentException | NullPointerException e) {
+            e.printStackTrace();
             new DialogBoxBuilder(ERROR).setMessage("Failed loading in image. \nError message: " + e.getMessage())
                     .build().show();
         }

src/main/java/edu/ntnu/idatt2001/carljgu/client/controllers/BattleController.java

@@ -107,7 +107,7 @@ public class BattleController implements Initializable {
                     Path currentPath = Paths.get("").toAbsolutePath();
                     String imagePath = Paths.get(currentPath.toString(), "src","main","resources","icons", "corrupt-file.png").toString();
                     dialogBoxBuilder.setImage(imagePath);
-                } catch(Exception e) {
+                } catch(IllegalArgumentException | NullPointerException e) {
                     new DialogBoxBuilder(ERROR).setMessage("Failed loading in image. \nError message: " + e.getMessage())
                             .build().show();
                 }

src/main/java/edu/ntnu/idatt2001/carljgu/filehandling/ArmyFileHandler.java

@@ -101,6 +101,8 @@ public class ArmyFileHandler {
                     int health = Integer.parseInt(unit[2].trim());
 
                     army.addUnit(unitFactory.createUnit(unitType, name, health));
+                } catch (NumberFormatException e) {
+                    readLinesSkipped.add("Line \"" + line + "\" skipped because health is not valid number because \" " + e.getMessage() + " \"");
                 } catch (IllegalArgumentException e) {
                     readLinesSkipped.add("Line \"" + line + "\" skipped because \"" + e.getMessage() + "\"");
                 } catch (ArrayIndexOutOfBoundsException e) {