Make gcl and git-cl don't throw when a vim user does :cg

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 824 matching lines @@
   fileobj.write(starting_text)
   fileobj.close()
 
   # Open up the default editor in the system to get the CL description.
   try:
     cmd = '%s %s' % (editor, filename)
     if sys.platform == 'win32' and os.environ.get('TERM') == 'msys':
       # Msysgit requires the usage of 'env' to be present.
       cmd = 'env ' + cmd
     # shell=True to allow the shell to handle all forms of quotes in $EDITOR.
-    subprocess.check_call(cmd, shell=True)
+    try:
+      subprocess.check_call(cmd, shell=True)
+    except subprocess.CalledProcessError, e:
+      DieWithError('Editor returned %d' % e.returncode)
     fileobj = open(filename)
     text = fileobj.read()
     fileobj.close()
   finally:
     os.remove(filename)
 
   if not text:
     return
 
   stripcomment_re = re.compile(r'^#.*$', re.MULTILINE)
@@ skipping 589 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:]))