adjusted all constuctors of nodes so that if someone creates a node the piece will be null and the option for a constuctor without arguments is still given for serialization purposes

Projekte/mdga/model/src/main/java/pp/mdga/game/Board.java

@@ -29,7 +29,7 @@ public Board() {
             } else if (i == 4 || i == 14 || i == 24 || i == 34) {
                 infield[i] = new BonusNode();
             } else {
-                infield[i] = new Node();
+                infield[i] = new Node(null);
             }
         }
     }

Projekte/mdga/model/src/main/java/pp/mdga/game/BonusNode.java

@@ -8,6 +8,6 @@
 @Serializable
 public class BonusNode extends Node {
     BonusNode(){
-        super();
+        super(null);
     }
 }

Projekte/mdga/model/src/main/java/pp/mdga/game/HomeNode.java

@@ -8,6 +8,6 @@
 @Serializable
 public class HomeNode extends Node {
     public HomeNode() {
-        super();
+        super(null);
     }
 }

Projekte/mdga/model/src/main/java/pp/mdga/game/Node.java

@@ -9,7 +9,11 @@
 public class Node {
     protected Piece occupant;
 
-    public Node(){
+    public Node(Piece piece){
+        occupant = piece;
+    }
+
+    private Node(){
         occupant = new Piece(Color.AIRFORCE, PieceState.WAITING);
     }
 

Projekte/mdga/model/src/main/java/pp/mdga/game/StartNode.java

@@ -18,10 +18,12 @@ public class StartNode extends Node {
      * @param color the color of the node
      */
     public StartNode(Color color) {
+        super(null);
         this.color = color;
     }
 
     private StartNode() {
+        super(null);
         color = Color.NONE;
     }