bandwidth_file_headers doesn't seem to be working

Moria http://128.31.0.34:9131/tor/status-vote/current/authority has a value for bandwidth-file-headers

From stem master, I run the following:

import stem.descriptor.remote
authority = stem.descriptor.remote.get_authorities()['moria1']
downloader = stem.descriptor.remote.DescriptorDownloader(fall_back_to_authority = False, document_handler = stem.descriptor.DocumentHandler.DOCUMENT)
vote = downloader.query('/tor/status-vote/current/authority.z', default_params = False, endpoints=[(authority.address, authority.dir_port)]).run()[0]
vote.bandwidth_file_headers

But I don't get any data...

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