[ocrfeeder] Change the DataBox's text argument's default value to '' instead of NULL

[Joaquim Manuel Pereira Rocha <jrocha src gnome org>]

commit 1852ac7c45db2aab36ad53b5ab02212851a22da4
Author: Joaquim Rocha <jrocha igalia com>
Date:   Thu Jul 8 10:40:45 2010 +0200

    Change the DataBox's text argument's default value to '' instead of NULL

 studio/dataHolder.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/studio/dataHolder.py b/studio/dataHolder.py
index f1e5237..0902b8a 100644
--- a/studio/dataHolder.py
+++ b/studio/dataHolder.py
@@ -70,7 +70,7 @@ class DataBox(gobject.GObject):
                      (gobject.TYPE_INT,))
         }
 
-    def __init__(self, x = 0, y = 0, width = 0, height = 0, image = None, type = TEXT_TYPE, text = None):
+    def __init__(self, x = 0, y = 0, width = 0, height = 0, image = None, type = TEXT_TYPE, text = ''):
         super(DataBox, self).__init__()
         self.x = int(x)
         self.y = int(y)