Fix the unhandled exception 'FileNotFoundError' that occurs in 'trashcli.list.SizeExtractor.extract_attribute()'

[jamescherti]

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This pull request fixes the unhandled exception FileNotFoundError that occurs in the method trashcli.list.SizeExtractor.extract_attribute().

The command-line tool trash-size raises the exception FileNotFoundError when a broken symbolic link is in the Trash:

 Traceback (most recent call last):
  File "/home/user/.pyvenv/bin/trash-list", line 5, in <module>
    sys.exit(main())
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/list.py", line 21, in main
    ListCmd(
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/list.py", line 64, in run
    self.list_trash(parsed.trash_dirs, extractor, parsed.show_files)
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/list.py", line 74, in list_trash
    self._print_trashinfo(volume, trash_info, extractor, show_files)
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/list.py", line 93, in _print_trashinfo
    attribute = extractor.extract_attribute(trashinfo_path, contents)
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/list.py", line 118, in extract_attribute
    return str(file_size(backup_copy))
  File "/home/user/.pyvenv/lib/python3.10/site-packages/trashcli/fs.py", line 96, in file_size
    return os.stat(path).st_size
FileNotFoundError: [Errno 2] No such file or directory: '/home/user/.local/share/Trash/files/broken-link'