Fixing UnboundLocalError: local variable 'timestamp' in manager.py

Tools/Scripts/webkitpy/layout_tests/controllers/manager.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 # Copyright (C) 2010 Gabor Rapcsanyi (rgabor@inf.u-szeged.hu), University of Szeged
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 143 matching lines @@
     def _rename_results_folder(self):
         try:
             timestamp = time.strftime("%Y-%m-%d-%H-%M-%S", time.localtime(self._filesystem.mtime(self._filesystem.join(self._results_directory, "results.html"))))
         except OSError, e:
             # It might be possible that results.html was not generated in previous run, because the test
             # run was interrupted even before testing started. In those cases, don't archive the folder.
             # Simply override the current folder contents with new results.
             import errno
             if e.errno == errno.EEXIST:
                 _log.warning("No results.html file found in previous run, skipping it.")
-                return None
+            return None
         archived_name = ''.join((self._filesystem.basename(self._results_directory), "_", timestamp))
         archived_path = self._filesystem.join(self._filesystem.dirname(self._results_directory), archived_name)
         self._filesystem.move(self._results_directory, archived_path)
 
     def _set_up_run(self, test_names):
         self._printer.write_update("Checking build ...")
         if self._options.build:
             exit_code = self._port.check_build(self.needs_servers(test_names), self._printer)
             if exit_code:
                 _log.error("Build check failed")
@@ skipping 283 matching lines @@
             return int(worker_name.split('/')[1]) if worker_name else -1
 
         stats = {}
         for result in initial_results.results_by_name.values():
             if result.type != test_expectations.SKIP:
                 stats[result.test_name] = {'results': (_worker_number(result.worker_name), result.test_number, result.pid, int(result.test_run_time * 1000), int(result.total_run_time * 1000))}
         stats_trie = {}
         for name, value in stats.iteritems():
             json_results_generator.add_path_to_trie(name, value, stats_trie)
         return stats_trie