TypeError: expected str, bytes or os.PathLike object, not NoneType

[hrxcodes]

Traceback (most recent call last):
  File "/usr/local/bin/pyrescene.py", line 1823, in <module>
    sys.exit(main())
             ^^^^^^
  File "/usr/local/bin/pyrescene.py", line 1722, in main
    result = generate_srr(release_dir, working_dir,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/bin/pyrescene.py", line 1124, in generate_srr
    if options.vobsub_srr and not unrar_is_available():
                                  ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/bin/pyrescene.py", line 130, in unrar_is_available
    return os.path.isfile(os.path.abspath(get_unrar()))
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen posixpath>", line 399, in abspath
TypeError: expected str, bytes or os.PathLike object, not NoneType

Happens when using --best and unrar not being installed. Need aditional guarding.