Regression in 2.3.7. sort_only: true creates corrupt subquery

[furedal]

I noticed that updating from 2.3.6 to 2.3.7 breaks queries using sort_only: true by adding a subquery with a WHERE clause with no condition.

See my example:

    pg_search_scope :sort_by_address,
                    ->(query, options = nil) {
                      search_options = {
                        query:     query,
                        against:   [:address],
                        using:     {
                          tsearch: {
                            prefix:     true,
                            any_word:   true,
                            sort_only:  true,
                            dictionary: 'simple'
                          }
                        },
                        ignoring:  :accents,
                        ranked_by: ':tsearch'
                      }
                      search_options = search_options.merge(options) if options.is_a?(Hash)
                      search_options
                    }

...
Item.sort_by_address('foo', order_within_rank: 'items.address')

This produces:

SELECT
	"items"."id"
FROM
	"items"
	INNER JOIN (
		SELECT
			"items"."id" AS pg_search_id,
			(ts_rank((to_tsvector('simple', f_unaccent (coalesce(("items"."address")::text, '')))), (to_tsquery('simple', ''' ' || f_unaccent ('foo') || ' ''' || ':*')), 0)) AS RANK
		FROM
			"items"
		WHERE
	) AS pg_search_3ae62594b1830faf2c5da4 ON "items"."id" = pg_search_3ae62594b1830faf2c5da4.pg_search_id
ORDER BY
	pg_search_3ae62594b1830faf2c5da4.rank DESC,
	items.address

Where the corrupted part is this part:

		FROM
			"items"
		WHERE
	)