From 74f406b505a762c8e55b210539a13ed66b0ae50a Mon Sep 17 00:00:00 2001
From: Walter Bender <walter.bender@gmail.com>
Date: Thu, 31 Mar 2011 13:06:17 +0000
Subject: catch IndexError exception that was causing run_blocks to fail

---
diff --git a/TurtleArt/talogo.py b/TurtleArt/talogo.py
index 59eb3c8..4662429 100644
--- a/TurtleArt/talogo.py
+++ b/TurtleArt/talogo.py
@@ -180,7 +180,11 @@ class LogoCode:
                 if b.connections is not None and len(b.connections) > 1 and \
                    b.connections[1] is not None:
                     code = self._blocks_to_code(b)
-                    x = b.connections[1].values[0]
+                    try:
+                        x = b.connections[1].values[0]
+                    except IndexError:
+                        self.tw.showlabel('#nostack')
+                        return None
                     if type(convert(x, float, False)) == float:
                         if int(float(x)) == x:
                             x = int(x)
--
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