[gnome-sudoku/gnome-3-10] check for none in set_value



commit 1e89689b37fe473a2528ca32e2b2ebe642524f63
Author: gQuigs gMail com <gQuigs gMail com>
Date:   Fri May 30 22:56:00 2014 -0500

    check for none in set_value
    
    This fixes undo when only one number is on the board.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731011

 src/lib/number_box.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/lib/number_box.py b/src/lib/number_box.py
index 0eb2188..8aa40ae 100644
--- a/src/lib/number_box.py
+++ b/src/lib/number_box.py
@@ -709,7 +709,7 @@ class NumberBox (Gtk.DrawingArea):
         pass
 
     def set_value (self, v):
-        if 0 < v <= self.upper:
+        if v != None and 0 < v <= self.upper:
             self.set_text(str(v))
         else:
             self.set_text('')


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