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595220a3a3
populate_recordset_worker() failed to consider the possibility that the
supplied JSON data contains no rows, so that update_cached_tupdesc never
got called. This led to a null-pointer dereference since commit 9a5e8ed28;
before that it led to a bogus "set-valued function called in context that
cannot accept a set" error. Fix by forcing the update to happen.
Per bug #15514. Back-patch to v11 as
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