json_object_agg return on no rows

Probably due to an oversight on my part, json_object_agg currently
returns a json object with no fields rather than NULL, which the docs
say it will, and which would be consistent with all other aggregates
except count().

I don't think we ever discussed this, so it's probably just a slip up.

I'm going to change it to return NULL in this case unless there is some
objection.

cheers

andrew

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