Reuse gcl.py's code review settings when running [gcl try], as gcl is ...

git-try

 #!/usr/bin/python
 # Copyright (c) 2010 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 for trychange.py for git checkout."""
 
 import logging
 import sys
 
 import breakpad
 
 import gclient_utils
 from scm import GIT
+import third_party.upload
 import trychange
 
 
 def GetRietveldIssueNumber():
   try:
     return GIT.Capture(
         ['config', 'branch.%s.rietveldissue' % GIT.GetBranch(None)])
   except gclient_utils.Error:
     return None
 
@@ skipping 20 matching lines @@
     args.extend([
         '--issue', GetRietveldIssueNumber(),
         '--patchset', patchset,
     ])
   else:
     rietveld_url = GetRietveldServerUrl()
     if rietveld_url:
       args.extend(['--rietveld_url', GetRietveldServerUrl()])
   # Hack around a limitation in logging.
   logging.getLogger().handlers = []
-  sys.exit(trychange.TryChange(
-    args, file_list=[], swallow_exception=False,
-    prog='git-try',
-    extra_epilog='\n'
-                  'git-try will diff against your tracked branch and will '
-                      'detect your rietveld\n'
-                  'code review if you are using git-cl\n'))
+  try:
+    sys.exit(trychange.TryChange(
+        args, file_list=[], swallow_exception=False,
+        prog='git-try',
+        extra_epilog='\n'
+                     'git-try will diff against your tracked branch and will '
+                     'detect your rietveld\n'
+                     'code review if you are using git-cl\n'))
+  except third_party.upload.ClientLoginError, e:
+    print('Got an exception while trying to log in to Rietveld.')
+    print(str(e))