BUG train_time not found

[maikia]

Happening on AWS worker

possibly related to: #483

Traceback (most recent call last):
  File "/opt/miniconda3/bin/ramp-launch", line 8, in <module>
    sys.exit(start())
  File "/opt/miniconda3/lib/python3.7/site-packages/ramp_engine/cli.py", line 122, in start
    main()
  File "/opt/miniconda3/lib/python3.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/opt/miniconda3/lib/python3.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/opt/miniconda3/lib/python3.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/miniconda3/lib/python3.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/miniconda3/lib/python3.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/opt/miniconda3/lib/python3.7/site-packages/ramp_engine/cli.py", line 90, in dispatcher
    disp.launch()
  File "/opt/miniconda3/lib/python3.7/site-packages/ramp_engine/dispatcher.py", line 315, in launch
    self.update_database_results(session)
  File "/opt/miniconda3/lib/python3.7/site-packages/ramp_engine/dispatcher.py", line 279, in update_database_results
    set_time(session, submission_id, path_predictions)
  File "/opt/miniconda3/lib/python3.7/site-packages/ramp_database/tools/submission.py", line 684, in set_time
    os.path.join(path_results, step + '_time')
  File "/opt/miniconda3/lib/python3.7/site-packages/numpy/lib/npyio.py", line 968, in loadtxt
    fh = np.lib._datasource.open(fname, 'rt', encoding=encoding)
  File "/opt/miniconda3/lib/python3.7/site-packages/numpy/lib/_datasource.py", line 269, in open
    return ds.open(path, mode, encoding=encoding, newline=newline)
  File "/opt/miniconda3/lib/python3.7/site-packages/numpy/lib/_datasource.py", line 623, in open
    raise IOError("%s not found." % path)
OSError: /home/ramp/ramp_deployment/events/human_locomotion_datacamp2020/predictions/submission_000007694/fold_1/train_time not found.