Fix gcl in the case there is no CODEREVIEW_SETTINGS file in the repository....

gcl.py

 #!/usr/bin/python
 # Copyright (c) 2006-2009 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.
 #
 # Wrapper script around Rietveld's upload.py that groups files into
 # changelists.
 
 import getpass
 import os
@@ skipping 160 matching lines @@
     FILES_CACHE[filename] = content
   return FILES_CACHE[filename]
 
 
 def GetCodeReviewSetting(key):
   """Returns a value for the given key for this repository."""
   # Use '__just_initialized' as a flag to determine if the settings were
   # already initialized.
   global CODEREVIEW_SETTINGS
   if '__just_initialized' not in CODEREVIEW_SETTINGS:
-    for line in GetCachedFile(CODEREVIEW_SETTINGS_FILE).splitlines():
-      if not line or line.startswith("#"):
-        continue
-      k, v = line.split(": ", 1)
-      CODEREVIEW_SETTINGS[k] = v
+    settings_file = GetCachedFile(CODEREVIEW_SETTINGS_FILE)
+    if settings_file:
+      for line in settings_file.splitlines():
+        if not line or line.startswith("#"):
+          continue
+        k, v = line.split(": ", 1)
+        CODEREVIEW_SETTINGS[k] = v
     CODEREVIEW_SETTINGS.setdefault('__just_initialized', None)
   return CODEREVIEW_SETTINGS.get(key, "")
 
 
 def Warn(msg):
   ErrorExit(msg, exit=False)
 
 
 def ErrorExit(msg, exit=True):
   """Print an error message to stderr and optionally exit."""
@@ skipping 936 matching lines @@
     # the files. This allows commands such as 'gcl diff xxx' to work.
     args =["svn", command]
     root = GetRepositoryRoot()
     args.extend([os.path.join(root, x) for x in change_info.FileList()])
     RunShell(args, True)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())