Changed Piece string repr

chess.py

@@ -103,10 +103,13 @@ class Piece:
 
     def __repr__(self):
         if None in (self.piece, self.color):
-            return None
+            return ""
         name = self.color.upper() + " CHESS " + self.piece.upper()
         return lookup(name)
 
+    def __str__(self):
+        return repr(self)
+
     def __eq__(self, other):
         if other == None:
             return  None in (self.color, self.piece)
@@ -426,4 +429,3 @@ def test():
             continue
         print(game)
 
-test()