Wrapper for ``_get``, which converts the thumbnail_name to String if necessary before
        calling ``_get``

        :rtype: Thumbnail

def get(self, thumbnail_name):
        """
        Wrapper for ``_get``, which converts the thumbnail_name to String if necessary before
        calling ``_get``

        :rtype: Thumbnail
        """
        if isinstance(thumbnail_name, list):
            thumbnail_name = '/'.join(thumbnail_name)
        return self._get(thumbnail_name)