[meld] Fix for recent syntax highlighting detection for file-less panes

[Kai Willadsen <kaiw src gnome org>]

commit 1af1740e77af57c2680f1f69739831f652dc0ebe
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Wed Oct 19 08:21:06 2011 +1000

    Fix for recent syntax highlighting detection for file-less panes

 meld/filediff.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/filediff.py b/meld/filediff.py
index 42b715e..595a790 100644
--- a/meld/filediff.py
+++ b/meld/filediff.py
@@ -1099,6 +1099,8 @@ class FileDiff(melddoc.MeldDoc, gnomeglade.Component):
             filename = self.bufferdata[i].filename
             if filename:
                 langs.append(srcviewer.get_language_from_file(filename))
+            else:
+                langs.append(None)
 
         # If we have only one identified language then we assume that all of
         # the files are actually of that type.