Fix rietveld when status is only one char

rietveld.py

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 """Defines class Rietveld to easily access a rietveld instance.
 
 Security implications:
 
 The following hypothesis are made:
 - Rietveld enforces:
   - Nobody else than issue owner can upload a patch set
@@ skipping 142 matching lines @@
           # It may happen on property-only change or svn copy without diff.
           if not diff:
             # Support this use case if it ever happen.
             raise patch.UnsupportedPatchFormat(
                 filename, 'Empty diff is not supported yet.\n')
           p = patch.FilePatchDiff(filename, diff, svn_props)
           out.append(p)
           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:
         raise patch.UnsupportedPatchFormat(
             filename, 'Change with status \'%s\' is not supported.' % status)
 
     return patch.PatchSet(out)
 
   @staticmethod
   def parse_svn_properties(rietveld_svn_props, filename):
@@ skipping 96 matching lines @@
         if retry >= (maxtries - 1):
           raise
         if not 'Name or service not known' in e.reason:
           # Usually internal GAE flakiness.
           raise
       # If reaching this line, loop again. Uses a small backoff.
       time.sleep(1+maxtries*2)
 
   # DEPRECATED.
   Send = get