the offloader is failing on 

CHROMEOS_RELEASE_BUILDER_PATH=guado_moblab-release/R60-9592.85.0

With the error:

File "/usr/local/autotest/site_utils/gs_offloader.py", line 1036, in <module>
    main()
  File "/usr/local/autotest/site_utils/gs_offloader.py", line 1029, in main
    offloader.offload_once()
  File "/usr/local/autotest/site_utils/gs_offloader.py", line 863, in offload_once
    job.enqueue_offload(queue, self._upload_age_limit)
  File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/usr/lib64/python2.7/site-packages/chromite/lib/parallel.py", line 750, in BackgroundTaskRunner
    queue.put(_AllTasksComplete())
  File "/usr/lib64/python2.7/site-packages/chromite/lib/parallel.py", line 750, in BackgroundTaskRunner
    queue.put(_AllTasksComplete())
  File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/usr/lib64/python2.7/site-packages/chromite/lib/parallel.py", line 561, in ParallelTasks
    raise BackgroundFailure(exc_infos=errors)
chromite.lib.parallel.BackgroundFailure: <type 'exceptions.UnboundLocalError'>: local variable 'stderr_content' referenced before assignment
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/chromite/lib/parallel.py", line 602, in TaskRunner
    task(*x, **task_kwargs)
  File "/usr/lib64/python2.7/site-packages/chromite/lib/metrics.py", line 303, in wrapper
    return fn(*args, **kwargs)
  File "/usr/local/autotest/site_utils/gs_offloader.py", line 686, in offload_dir
    if 'CommandException: Error opening file' in stderr_content:
UnboundLocalError: local variable 'stderr_content' referenced before assignment