When I have a block that has many null values,such as: [x] [] [] [] [] [] [] [] [] I want the block to go right since there are no tiles to prevent this move how can i do that? public void setTile(int y, int x, Tile t){          if (y >= 0 && y < board.size() && x >= 0 && x < board.get(y).size()) {             board.get(y).set(x, t);         }     }     public Tile getTile(int y, int x){          // return board.get(y).get(x);         if (y >= 0 && y < board.size() && x >= 0 && x < board.get(y).size()) {             return board.get(y).get(x);         } else {             throw new RuntimeException("Invalid indices provided for getTile");         }     } public int getY()      {         return y;     }     public int getX()      {         return x;     }  public int getWidth(){          return board.size()>0?board.get(0).size():0;     }     public int getHeight(){         return board.size();     } public static boolean moveRight(Board bd, Block bk) { } help me please

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