Fix rietveld when status is only one char

rietveld.py

Index: rietveld.py
diff --git a/rietveld.py b/rietveld.py
index 6f4f4ae7fd864e07355c572dd79011157a7bda92..e64a46d1c9decd04ecf2266cb1501667945530c4 100644
--- a/rietveld.py
+++ b/rietveld.py
@@ -160,7 +160,9 @@ class Rietveld(object):
           if status[0] == 'A':
             # It won't be set for empty file.
             p.is_new = True
-          if status[1] == '+' and not (p.source_filename or p.svn_properties):
+          if (len(status) > 1 and
+              status[1] == '+' and
+              not (p.source_filename or p.svn_properties)):
             raise patch.UnsupportedPatchFormat(
                 filename, 'Failed to process the svn properties')
       else: