Find reason for 'null' values in Onionoo document

See comment:1 for a data example. Next steps:

  • determine possible cause of null-values (incl. data check on CollecTor)
  • discuss, if this is a desirable feature or bug
  • fix cause, if ncessary

Initial report: This relay shows that there was 0 read/write bytes per second for almost a month even though the Consensus Weight stays above 8000. https://atlas.torproject.org/#details/5D86AFD7CE409251E67B373B4F0E780A0F41C944

Trac:
Username: Dbryrtfbcbhgf