Corrections mineures de Grid

src/main/java/model/EmptyGrid.java

@@ -29,19 +29,4 @@ public class EmptyGrid implements Grid{
   @Override
   public void fill(TileGenerator tileGenerator) {
   }
-
-  @Override
-  public Iterator<Square> iterator() {
-    return new Iterator<>() {
-      @Override
-      public boolean hasNext() {
-        return false;
-      }
-
-      @Override
-      public Square next() {
-        return EmptySquare.EMPTY_SQUARE;
-      }
-    };
-  }
 }

src/main/java/model/Grid.java

 package model;
 
-public interface Grid extends Iterable<Square>{
+public interface Grid{
   Square getSquare(int rowIndex, int columnIndex);
   int getNumberOfRows();
   int getNumberOfColumns();