Gets past broken build for --mode debug

tools/upload_sdk.py

 #!/usr/bin/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.
 
 # This zips the SDK and uploads it to Google Storage when run on a buildbot.
 
 import os
 import subprocess
@@ skipping 34 matching lines @@
 
 def GetSVNRevision():
   p = subprocess.Popen(['svn', 'info'], stdout = subprocess.PIPE,
       stderr = subprocess.STDOUT, close_fds=True)
   output, not_used = p.communicate()
   for line in output.split('\n'):
     if 'Revision' in line:
       return (line.strip().split())[1]
   return None
 
+
+def usage(progname):
+    sys.stderr.write('Usage: %s path_to_sdk\n' % progname)
+
+
 def main(argv):
-  if (not os.path.exists(argv[1])):
-    sys.stderr.write('Usage: upload_sdk.py path_to_sdk\n')
+  if not os.path.exists(argv[1]):
+    sys.stderr.write('Path not found: %s\n' % argv[1])
+    usage(argv[0])
     return 1
   if (not os.path.exists(GSUTIL)):
     exit(0)
   revision = GetSVNRevision()
-  if revision == None:
+  if revision is None:
     sys.stderr.write('Unable to find SVN revision.\n')
     return 1
   os.chdir(argv[1])
   # TODO(dgrove) - deal with architectures that are not ia32.
   sdk_name = 'dart-' + utils.GuessOS() + '-' + revision + '.zip'
-  sdk_file = '../' + sdk_name 
+  sdk_file = '../' + sdk_name
   ExecuteCommand(['zip', '-yr', sdk_file, '.'])
   UploadArchive(sdk_file, GS_SITE + os.path.join(GS_DIR, SDK, sdk_name))
   latest_name = 'dart-' + utils.GuessOS() + '-latest' + '.zip'
   UploadArchive(sdk_file, GS_SITE + os.path.join(GS_DIR, SDK, latest_name))
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))