From 8fcb80b6bc42a1c3bbad8b5c19942c93ae6a1e12 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Sat, 14 Dec 2013 20:00:10 +0000
Subject: fix potential issue with init values=[] (rgs)

---
(limited to 'TurtleArt/tablock.py')

diff --git a/TurtleArt/tablock.py b/TurtleArt/tablock.py
index 402de33..81bdd2a 100644
--- a/TurtleArt/tablock.py
+++ b/TurtleArt/tablock.py
@@ -183,7 +183,7 @@ class Block:
         trash -- block in the trash """
 
     def __init__(self, block_list, sprite_list, name, x, y, type='block',
-                 values=[], scale=BLOCK_SCALE[0],
+                 values=None, scale=BLOCK_SCALE[0],
                  colors=['#A0A0A0', '#808080']):
 
         self.block_list = block_list
@@ -256,8 +256,9 @@ class Block:
             self.font_size[i] *= self.scale * \
                 self.block_list.font_scale_factor
 
-        for v in (values):
-            self.values.append(v)
+        if values is not None:
+            for v in (values):
+                self.values.append(v)
 
         # If there is already a block with the same name, reuse it
         copy_block = None
--
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