Initializes correctly 'url'.

git_cl.py

 #!/usr/bin/env python
 # 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.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld."""
 
 import errno
@@ skipping 209 matching lines @@
       # 2) find the svn-remote that fetches from the URL.
 
       # regexp matching the git-svn line that contains the URL.
       git_svn_re = re.compile(r'^\s*git-svn-id: (\S+)@', re.MULTILINE)
 
       # We don't want to go through all of history, so read a line from the
       # pipe at a time.
       # The -100 is an arbitrary limit so we don't search forever.
       cmd = ['git', 'log', '-100', '--pretty=medium']
       proc = Popen(cmd, stdout=subprocess.PIPE)
+      url = None
       for line in proc.stdout:
         match = git_svn_re.match(line)
         if match:
           url = match.group(1)
           proc.stdout.close()  # Cut pipe.
           break
 
       if url:
         svn_remote_re = re.compile(r'^svn-remote\.([^.]+)\.url (.*)$')
         remotes = RunGit(['config', '--get-regexp',
@@ skipping 1231 matching lines @@
              'and retry or visit go/isgaeup.\n%s') % (e.code, str(e)))
 
   # Not a known command. Default to help.
   GenUsage(parser, 'help')
   return CMDhelp(parser, argv)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   sys.exit(main(sys.argv[1:]))