[metrics-bugs] #22168 [Metrics/Onionoo]: Do not return empty objects

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#22168: Do not return empty objects
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     Reporter:  cypherpunks      |      Owner:  metrics-team
         Type:  defect           |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 In some instances Onionoo returns relay and bridge arrays with empty
 objects. This seems like a waste of bandwidth. Next are some URLs that
 return arrays with empty objects.

 https://onionoo.torproject.org/details?fields=a (non-existing fields makes
 both arrays consist of only empty objects)
 https://onionoo.torproject.org/details?fields=fingerprint (using a field
 that only exists for relays makes the bridge array consist of only empty
 objects)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22168>
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