From 83420deffde8064001a8296e6ccb39a18e588d70 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter.bender@gmail.com>
Date: Thu, 22 Mar 2012 15:19:52 +0000
Subject: catch attribute errors when sprite is None

---
diff --git a/TurtleArt/tawindow.py b/TurtleArt/tawindow.py
index fbc0eff..b324c7b 100644
--- a/TurtleArt/tawindow.py
+++ b/TurtleArt/tawindow.py
@@ -758,7 +758,11 @@ class TurtleArtWindow():
             self._layout_palette(n, regenerate=regenerate, show=False)
         for blk in self.palettes[n]:
             if blk.get_visibility():
-                blk.spr.set_layer(PROTO_LAYER)
+                try:
+                    blk.spr.set_layer(PROTO_LAYER)
+                except AttributeError:
+                    debug_output('block sprite is None' % (blk.name),
+                                 self.running_sugar)
             else:
                 blk.spr.hide()
         if n == palette_names.index('trash'):
@@ -871,8 +875,13 @@ class TurtleArtWindow():
                         'proto', [], PALETTE_SCALE))
                 if name in hidden_proto_blocks:
                     self.palettes[n][-1].set_visibility(False)
-            self.palettes[n][-1].spr.set_layer(PROTO_LAYER)
-            self.palettes[n][-1].unhighlight()
+                else:
+                    try:
+                        self.palettes[n][-1].spr.set_layer(PROTO_LAYER)
+                        self.palettes[n][-1].unhighlight()
+                    except AttributeError:
+                        debug_output('block sprite is None' % (blk.name),
+                                     self.running_sugar)
 
             # Some proto blocks get a skin.
             if name in block_styles['box-style-media']:
--
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