82a0ba7707
Commit 7259736a6e added the capability to stream changes in ReorderBuffer which has some tests to test the streaming mode. It is quite possible that while this test is running a parallel transaction could be logged by autovacuum. Such a transaction won't perform any insert/update/delete to non-catalog tables so will be shown as an empty transaction. Fix it by skipping the empty transactions during this test. Per report by buildfarm.
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