KeyError: 'path' when browsing directory with the legacy URL

Sentry Issue: SWH-WEBAPP-4NT

KeyError: 'path'
  File "django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "swh/web/browse/views/directory.py", line 291, in directory_browse_legacy
    return _directory_browse(request, sha1_git, path)
  File "swh/web/browse/views/directory.py", line 48, in _directory_browse
    params["path"] = f'{sha1_git}/{params["path"]}'

eg. https://archive.softwareheritage.org/browse/directory/636fb7eac091c50fed50ec780dac90f76e3589d7/src/doc/common/static/logo_sagemath_white.svg/