Do not enforce HEAD when a revision is not specified.

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."""
 
 import json
@@ skipping 1580 matching lines @@
       (b, forced_tests) for b, t in builders_and_tests.iteritems()
       if t != ['compile'])
 
   patchset = cl.GetPatchset()
   if not cl.GetPatchset():
     patchset = cl.GetMostRecentPatchset(cl.GetIssue())
 
   cl.RpcServer().trigger_try_jobs(
       cl.GetIssue(), patchset, options.name, options.clobber, options.revision,
       builders_and_tests)
+  print('Tried jobs on:')
+  length = max(len(builder) for builder in builders_and_tests)
+  for builder in sorted(builders_and_tests):
+    print '  %*s: %s' % (length, builder, ','.join(builders_and_tests[builder]))
   return 0
 
 
 @usage('[new upstream branch]')
 def CMDupstream(parser, args):
   """prints or sets the name of the upstream branch, if any"""
   _, args = parser.parse_args(args)
   if len(args) > 1:
     parser.error('Unrecognized args: %s' % ' '.join(args))
     return 0
@@ skipping 93 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:]))