Take care to reprocess an uncommitted notify message.
Take care to reprocess an uncommitted notify message.

Oversight in my changes to cope with possible errors during message
processing; spotted by Joachim Wieland.

oberstet/postgres-xl,postmind-net/postgres-xl,kmjungersen/PostgresXL,50wu/gpdb,50wu/gpdb,arcivanov/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,yazun/postgres-xl,lisakowen/gpdb,arcivanov/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,lisakowen/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,jmcatamney/gpdb,ovr/postgres-xl,zeroae/postgres-xl,ashwinstar/gpdb,techdragon/Postgres-XL,adam8157/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl,postmind-net/postgres-xl,xinzweb/gpdb,50wu/gpdb,jmcatamney/gpdb,postmind-net/postgres-xl,yazun/postgres-xl,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,zeroae/postgres-xl,jmcatamney/gpdb,xinzweb/gpdb,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,tpostgres-projects/tPostgres,50wu/gpdb,snaga/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,50wu/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,lisakowen/gpdb,xinzweb/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,xinzweb/gpdb,oberstet/postgres-xl,greenplum-db/gpdb,pavanvd/postgres-xl,snaga/postgres-xl,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,lisakowen/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,snaga/postgres-xl,ovr/postgres-xl,lisakowen/gpdb,50wu/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,adam8157/gpdb,lisakowen/gpdb,postmind-net/postgres-xl,techdragon/Postgres-XL,snaga/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,jmcatamney/gpdb,techdragon/Postgres-XL,arcivanov/postgres-xl,adam8157/gpdb,greenplum-db/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,xinzweb/gpdb,pavanvd/postgres-xl,ashwinstar/gpdb,ovr/postgres-xl,oberstet/postgres-xl,xinzweb/gpdb,kmjungersen/PostgresXL,greenplum-db/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,yazun/postgres-xl,Postgres-XL/Postgres-XL,snaga/postgres-xl,xinzweb/gpdb,adam8157/gpdb,ovr/postgres-xl,50wu/gpdb,ashwinstar/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,50wu/gpdb,arcivanov/postgres-xl,yazun/postgres-xl,ashwinstar/gpdb,greenplum-db/gpdb