Handle tries of results data in upload (fix _is_directory).

Tools/TestResultServer/model/jsonresults_unittest.py

 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # 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
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 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 1144 matching lines @@
         JsonResults.update(master['url_name'], builder, test_type, test_data[1], master['name'], True)
         # Verify that the file keyed by url_name contains both sets of results.
         files = TestFile.get_files(master['url_name'], builder, test_type, None, None, limit=3)
         self.assertEqual(len(files), 2)
         for f in files:
             j = json.loads(f.data)
             self.assertItemsEqual(j[builder]['blinkRevision'], ['12345', '54321'])
 
         tb.deactivate()
 
+    def test_normalize_results_with_top_level_results_key_does_not_crash(self):
+        aggregated_json = {
+            'Linux Tests': {
+                'results': {'foo': {'results': [(1, 'P')],
+                                    'times': [(1, 1)]}},
+            }
+        }
+        JsonResults._normalize_results(aggregated_json, 1, 2)
+
 if __name__ == '__main__':
     unittest.main()