If there are no bandwidth authorities, doctor crashes
If there are no bandwidth authorities (or presumably, no bandwidth authority votes on anything), doctor crashes with the following:
Traceback (most recent call last):
File "./consensus_health_checker.py", line 746, in <module>
main()
File "./consensus_health_checker.py", line 243, in main
issues += run_checks(consensuses, votes)
File "./consensus_health_checker.py", line 325, in run_checks
issues = checker(latest_consensus, consensuses, votes)
File "./consensus_health_checker.py", line 678, in bandwidth_authorities_in_sync
average = sum(measurement_counts.values()) / len(measurement_counts)
ZeroDivisionError: integer division or modulo by zero