From 7324e6cda8abae54111c5f886c8069812fb040bc Mon Sep 17 00:00:00 2001
From: Marion <marion.zepf@gmail.com>
Date: Sat, 02 Nov 2013 10:46:46 +0000
Subject: Fixes #4641 "Save as Python fails when stack is empty"

Check whether the list is empty before accessing an element.
---
diff --git a/TurtleArt/taexportpython.py b/TurtleArt/taexportpython.py
index 458b886..c7d903d 100644
--- a/TurtleArt/taexportpython.py
+++ b/TurtleArt/taexportpython.py
@@ -116,7 +116,7 @@ def _action_stack_to_python(block, tw, name="start"):
 
     # traverse the block stack and get the AST for every block
     ast_list = _walk_action_stack(block, tw.lc)
-    if not isinstance(ast_list[-1], ast.Yield):
+    if not ast_list or not isinstance(ast_list[-1], ast.Yield):
         ast_list.append(ast_yield_true())
     action_stack_ast = ast.Module(body=ast_list)
     #debug_output(str(action_stack_ast))
--
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