Fix drover regression introduced in r80453.

drover.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.
 
 import optparse
 import os
 import re
 import sys
 
@@ skipping 46 matching lines @@
 
   command = "%s %s" % (gcl_path, subcommand)
   return os.system(command)
 
 def gclUpload(revision, author):
   command = ("upload " + str(revision) +
              " --send_mail --no_presubmit --reviewers=" + author)
   return runGcl(command)
 
 def getSVNInfo(url, revision):
-  svn_info = subprocess2.check_output(
-      ['svn', 'info', '%s@%s' % (url, revision)]).splitlines()
   info = {}
-  for line in svn_info:
-    match = re.search(r"(.*?):(.*)", line)
-    if match:
-      info[match.group(1).strip()]=match.group(2).strip()
-
+  try:
+    svn_info = subprocess2.check_output(
+        ['svn', 'info', '%s@%s' % (url, revision)]).splitlines()
+    for line in svn_info:
+      match = re.search(r"(.*?):(.*)", line)
+      if match:
+        info[match.group(1).strip()] = match.group(2).strip()
+  except subprocess2.CalledProcessError:
+    pass
   return info
 
 def isSVNDirty():
   svn_status = subprocess2.check_output(['svn', 'status']).splitlines()
   for line in svn_status:
     match = re.search(r"^[^X?]", line)
     if match:
       return True
 
   return False
@@ skipping 459 matching lines @@
 
   if options.local and (options.revert or options.branch):
     option_parser.error("--local cannot be used with --revert or --branch")
     return 1
 
   return drover(options, args)
 
 
 if __name__ == "__main__":
   sys.exit(main())