Do not return empty objects
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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