Traceback (most recent call last):
  File "/root/plot_manager/drive_manager.py", line 416, in <module>
    main()
  File "/root/plot_manager/drive_manager.py", line 410, in main
    send_new_plot_disk_email()
  File "/root/plot_manager/drive_manager.py", line 296, in send_new_plot_disk_email
    drive_serial_number=Device(get_device_by_mountpoint(get_plot_drive_to_use())[0][1]).serial,
  File "/usr/local/lib/python3.8/dist-packages/pySMART/device.py", line 222, in __init__
    cmd = Popen(
  File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1583, in _execute_child
    and os.path.dirname(executable)
  File "/usr/lib/python3.8/posixpath.py", line 152, in dirname
    p = os.fspath(p)
TypeError: expected str, bytes or os.PathLike object, not NoneType