RS fails to display bw graphs for relays where onionoo provides 3_days level and not 1_month level data

https://lists.torproject.org/pipermail/metrics-team/2018-March/000729.html https://lists.torproject.org/pipermail/metrics-team/2018-March/000730.html https://lists.torproject.org/pipermail/metrics-team/2018-March/000731.html