[PG]: Fix set transaction empty config error in pg-core #3580
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When an empty config object is supplied for postgres transactions, the client issues the query
'set transaction ;'
which causes a postgres parsing error for the pglite and postgres-js drivers. This commit uses the same approach seen in drizzle-orm's mysql-core here and here to only execute theset transaction
sql when a non-empty config object is supplied to the transaction.Addresses bug identified in this issue.