'Stores stat entry in the flow\'s state.'

@flow.StateHandler()
def StoreStat(self, responses):

    index = responses.request_data['index']
    if (not responses.success):
        self.Log('Failed    to    stat    file:    %s', responses.status)
        self._FileFetchFailed(index, responses.request.request.name)
        return
    tracker = self.state.pending_hashes[index]
    tracker['stat_entry'] = responses.First()
