From 158d685f3cc6dd88be0213f95bd1b231974b3a29 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter.bender@gmail.com>
Date: Sat, 20 Oct 2012 11:53:33 +0000
Subject: handle case where number is ''

---
diff --git a/TurtleArt/tawindow.py b/TurtleArt/tawindow.py
index 479ecfb..e63ac7e 100644
--- a/TurtleArt/tawindow.py
+++ b/TurtleArt/tawindow.py
@@ -3156,6 +3156,8 @@ class TurtleArtWindow():
 
     def _number_check(self, n):
         n = n.strip()  # Ignore any whitespace
+        if n == '':
+            n = '0'
         if n in ['-', '.', '-.', ',', '-,']:
             n = 0
         elif n is not None:
@@ -3189,6 +3191,8 @@ class TurtleArtWindow():
         s = self.text_entry.get_buffer().get_text(bounds[0],
                                                   bounds[1])
         if self.selected_blk.type == 'number':
+            if s == '':
+                s = '0'
             self._number_check(s)
         else:
             self._string_check(s)
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