Dont require /home/chrome-bot

R=navabi@chromium.org
NOTRY=true
BUG=460630

Review URL: https://codereview.chromium.org/946733002

Cr-Commit-Position: refs/heads/master@{#317448}

build/android/buildbot/bb_device_status_check.py

@@ -337,6 +337,7 @@ def main():
         zip(*[DeviceInfo(dev, options) for dev in devices]))
 
   # Write device info to file for buildbot info display.
+  if os.path.exists('/home/chrome-bot'):
     with open('/home/chrome-bot/.adb_device_info', 'w') as f:
       for device in json_data:
         f.write('%s %s %s %.1fC %s%%\n' % (device['serial'], device['type'],