Fix compatibility with svn 1.7.

scm.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.
 
 """SCM-specific utility classes."""
 
 import cStringIO
 import glob
 import logging
 import os
@@ skipping 560 matching lines @@
     result = {}
     info = ElementTree.XML(SVN.Capture(['info', '--xml'] + files, cwd))
     if info is None:
       return result
     entry = info.find('entry')
     if entry is None:
       return result
 
     # Use .text when the item is not optional.
     result['Path'] = entry.attrib['path']
-    result['Revision'] = int(entry.attrib['revision'])
+    rev = entry.attrib['revision']
+    try:
+      result['Revision'] = int(rev)
+    except ValueError:
+      result['Revision'] = None
     result['Node Kind'] = entry.attrib['kind']
     # Differs across versions.
     if result['Node Kind'] == 'dir':
       result['Node Kind'] = 'directory'
     result['URL'] = entry.find('url').text
     repository = entry.find('repository')
     result['Repository Root'] = repository.find('root').text
     result['UUID'] = repository.find('uuid')
     wc_info = entry.find('wc-info')
     if wc_info is not None:
@@ skipping 452 matching lines @@
         # revert, like for properties.
         if not os.path.isdir(cwd):
           # '.' was deleted. It's not worth continuing.
           return
         try:
           SVN.Capture(['revert', file_status[1]], cwd=cwd)
         except subprocess2.CalledProcessError:
           if not os.path.exists(file_path):
             continue
           raise