Added check for None missed in recent commit.

Reported by fta At sofaraway.org

BUG=None
TEST=None
TBR=evan@chromium.org

Review URL: http://codereview.chromium.org/6610013

git-svn-id: http://src.chromium.org/svn/trunk/src/build@76733 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

util/lastchange.py

@@ -115,7 +115,9 @@ def IsGitSVN(directory):
   # svn-related configuration.  This command exits with an error code
   # if there aren't any matches, so ignore its output.
   proc = RunGitCommand(directory, ['config', '--get-regexp', '^svn'])
-  return (proc.wait() == 0)
+  if proc:
+    return (proc.wait() == 0)
+  return false
 
 
 def FetchGitSVNURL(directory):