[extensions-web] Guard diffview against an empty region

[Jasper St. Pierre <jstpierre src gnome org>]

commit 1d4d331b11b65c581f5f70667d856f69d7ea7ac5
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Nov 19 14:17:16 2011 -0500

    Guard diffview against an empty region

 sweettooth/review/diffview.py |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/sweettooth/review/diffview.py b/sweettooth/review/diffview.py
index b6fc431..6598ec2 100644
--- a/sweettooth/review/diffview.py
+++ b/sweettooth/review/diffview.py
@@ -71,10 +71,18 @@ def get_replaced_markup(chunk, old, new):
         newcontent = new[line[2] - 1]
         oldregion = line[3]
         newregion = line[4]
-        oldlines.append(REPLACED_REGION % \
-                            (''.join(get_line_region_markup(oldcontent, oldregion)),))
-        newlines.append(REPLACED_REGION % \
-                            (''.join(get_line_region_markup(newcontent, newregion)),))
+
+        if oldregion is not None:
+            oldlines.append(REPLACED_REGION % \
+                                (''.join(get_line_region_markup(oldcontent, oldregion)),))
+        else:
+            oldlines.append(REPLACED_REGION % (oldcontent,))
+
+        if newregion is not None:
+            newlines.append(REPLACED_REGION % \
+                                (''.join(get_line_region_markup(newcontent, newregion)),))
+        else:
+            newlines.append(REPLACED_REGION % (newcontent,))
 
     return oldlines, newlines