[Android] Don't use a device blacklist if one isn't provided. (RELAND)

testing/scripts/host_info.py

 #!/usr/bin/env python
 # Copyright 2015 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.
 
 import json
 import multiprocessing
 import os
 import platform
 import subprocess
@@ skipping 48 matching lines @@
     return {}
 
   with common.temporary_file() as tempfile_path:
     rc = common.run_command([
         sys.executable,
         os.path.join(args.paths['checkout'],
                      'build',
                      'android',
                      'buildbot',
                      'bb_device_status_check.py'),
-        '--json-output', tempfile_path])
+        '--json-output', tempfile_path,
+        '--blacklist-file', os.path.join(
+            args.paths['checkout'], 'out', 'bad_devices.json')])
 
     if rc:
       failures.append('bb_device_status_check')
       return {}
 
     with open(tempfile_path, 'r') as src:
       device_info = json.load(src)
 
   results = {}
   results['devices'] = sorted(v['serial'] for v in device_info)
@@ skipping 47 matching lines @@
 def main_compile_targets(args):
   json.dump([], args.output)
 
 
 if __name__ == '__main__':
   funcs = {
     'run': main_run,
     'compile_targets': main_compile_targets,
   }
   sys.exit(common.run_script(sys.argv[1:], funcs))