Small fix for cases where the data or report dirs are not specified.

BUG=none
TEST=We should run those scripts with and without the optional arguments :-)


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17088 0039d316-1c4b-4281-b951-d872f2087c98

tools/purify/purify_test.py

@@ -64,6 +64,7 @@ def CreateOptionParser(self):
                             help="path where report files are saved")
 
   def ParseArgv(self):
+    script_dir = google.path_utils.ScriptDir()
     if common.Rational.ParseArgv(self):
       if self._options.exe:
         self._exe = self._options.exe;