ENG-12478: ignore assertion not open txns for generate swaptable event (#4531)
ENG-12478: ignore assertion not open txns for generate swaptable event (#4531)


simonzhangsm/voltdb,deerwalk/voltdb,VoltDB/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,VoltDB/voltdb,deerwalk/voltdb,VoltDB/voltdb,deerwalk/voltdb,deerwalk/voltdb,VoltDB/voltdb,deerwalk/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,VoltDB/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,simonzhangsm/voltdb,VoltDB/voltdb