Fix pg_prepared_statements.result_types for DML statements

Peter Eisentraut <peter@eisentraut.org>

Commit: 6ffff0fd225432fe2ae4bd5abb7ff6113e255418
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2022-07-05T08:26:36Z
Releases: 16.0
Fix pg_prepared_statements.result_types for DML statements

Amendment to 84ad713cf85aeffee5dd39f62d49a1b9e34632da: Not all
prepared statements have a result descriptor.  As currently coded,
this would crash when reading pg_prepared_statements.  Make those
cases return null for result_types instead.  Also add a test case for
it.

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