Gerrit git cl: make it work with minimal file.

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 and Gerrit."""
 
 from __future__ import print_function
@@ skipping 3046 matching lines @@
   """Parse a codereview.settings file and updates hooks."""
   keyvals = gclient_utils.ParseCodereviewSettingsContent(fileobj.read())
 
   def SetProperty(name, setting, unset_error_ok=False):
     fullname = 'rietveld.' + name
     if setting in keyvals:
       RunGit(['config', fullname, keyvals[setting]])
     else:
       RunGit(['config', '--unset-all', fullname], error_ok=unset_error_ok)
 
-  SetProperty('server', 'CODE_REVIEW_SERVER')
+  if not keyvals.get('GERRIT_HOST', False):
+    SetProperty('server', 'CODE_REVIEW_SERVER')
   # Only server setting is required. Other settings can be absent.
   # In that case, we ignore errors raised during option deletion attempt.
   SetProperty('cc', 'CC_LIST', unset_error_ok=True)
   SetProperty('private', 'PRIVATE', unset_error_ok=True)
   SetProperty('tree-status-url', 'STATUS', unset_error_ok=True)
   SetProperty('viewvc-url', 'VIEW_VC', unset_error_ok=True)
   SetProperty('bug-prefix', 'BUG_PREFIX', unset_error_ok=True)
   SetProperty('cpplint-regex', 'LINT_REGEX', unset_error_ok=True)
   SetProperty('force-https-commit-url', 'FORCE_HTTPS_COMMIT_URL',
               unset_error_ok=True)
@@ skipping 2294 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   setup_color.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)