[Android] Only remember non-None iteration results.

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # Copyright 2013 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.
 
 """Runs all types of tests from one unified interface."""
 
 import argparse
 import collections
@@ skipping 941 matching lines @@
 
   with environment_factory.CreateEnvironment(args, infra_error) as env:
     with test_instance_factory.CreateTestInstance(args, infra_error) as test:
       with test_run_factory.CreateTestRun(
           args, env, test, infra_error) as test_run:
         results = []
         repetitions = (xrange(args.repeat + 1) if args.repeat >= 0
                        else itertools.count())
         for _ in repetitions:
           iteration_results = test_run.RunTests()
-          results.append(iteration_results)
 
           if iteration_results is not None:
+            results.append(iteration_results)
             report_results.LogFull(
                 results=iteration_results,
                 test_type=test.TestType(),
                 test_package=test_run.TestPackage(),
                 annotation=getattr(args, 'annotations', None),
                 flakiness_server=getattr(args, 'flakiness_dashboard_server',
                                          None))
 
         if args.json_results_file:
           json_results.GenerateJsonResultsFile(
@@ skipping 64 matching lines @@
     if e.is_infra_error:
       return constants.INFRA_EXIT_CODE
     return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())