Don't crash when a rowtype argument to a plpgsql function is NULL. Per report from Chris Campbell.
Don't crash when a rowtype argument to a plpgsql function is NULL.
Per report from Chris Campbell.

ovr/postgres-xl,yuanzhao/gpdb,edespino/gpdb,lintzc/gpdb,xuegang/gpdb,zaksoup/gpdb,cjcjameson/gpdb,lisakowen/gpdb,cjcjameson/gpdb,adam8157/gpdb,lintzc/gpdb,royc1/gpdb,oberstet/postgres-xl,arcivanov/postgres-xl,rubikloud/gpdb,oberstet/postgres-xl,tangp3/gpdb,pavanvd/postgres-xl,tpostgres-projects/tPostgres,Chibin/gpdb,janebeckman/gpdb,adam8157/gpdb,ahachete/gpdb,Quikling/gpdb,ovr/postgres-xl,oberstet/postgres-xl,Quikling/gpdb,randomtask1155/gpdb,50wu/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,randomtask1155/gpdb,jmcatamney/gpdb,janebeckman/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,CraigHarris/gpdb,rvs/gpdb,zaksoup/gpdb,yazun/postgres-xl,zeroae/postgres-xl,Postgres-XL/Postgres-XL,ahachete/gpdb,janebeckman/gpdb,greenplum-db/gpdb,lintzc/gpdb,zeroae/postgres-xl,adam8157/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,chrishajas/gpdb,0x0FFF/gpdb,pavanvd/postgres-xl,rubikloud/gpdb,janebeckman/gpdb,chrishajas/gpdb,Chibin/gpdb,lisakowen/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,foyzur/gpdb,xinzweb/gpdb,edespino/gpdb,snaga/postgres-xl,snaga/postgres-xl,Chibin/gpdb,Quikling/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,xinzweb/gpdb,janebeckman/gpdb,yazun/postgres-xl,rvs/gpdb,randomtask1155/gpdb,0x0FFF/gpdb,Quikling/gpdb,lpetrov-pivotal/gpdb,ahachete/gpdb,Chibin/gpdb,CraigHarris/gpdb,lpetrov-pivotal/gpdb,cjcjameson/gpdb,ahachete/gpdb,rvs/gpdb,royc1/gpdb,lisakowen/gpdb,tangp3/gpdb,postmind-net/postgres-xl,chrishajas/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,atris/gpdb,jmcatamney/gpdb,CraigHarris/gpdb,yazun/postgres-xl,50wu/gpdb,adam8157/gpdb,arcivanov/postgres-xl,xinzweb/gpdb,yazun/postgres-xl,lisakowen/gpdb,lintzc/gpdb,adam8157/gpdb,Quikling/gpdb,Chibin/gpdb,adam8157/gpdb,postmind-net/postgres-xl,techdragon/Postgres-XL,rubikloud/gpdb,atris/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,yuanzhao/gpdb,kmjungersen/PostgresXL,xinzweb/gpdb,lisakowen/gpdb,janebeckman/gpdb,CraigHarris/gpdb,chrishajas/gpdb,lintzc/gpdb,zeroae/postgres-xl,xinzweb/gpdb,postmind-net/postgres-xl,janebeckman/gpdb,yuanzhao/gpdb,atris/gpdb,jmcatamney/gpdb,Quikling/gpdb,lisakowen/gpdb,royc1/gpdb,royc1/gpdb,50wu/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,tangp3/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,atris/gpdb,royc1/gpdb,xuegang/gpdb,cjcjameson/gpdb,50wu/gpdb,xuegang/gpdb,rvs/gpdb,rubikloud/gpdb,royc1/gpdb,ashwinstar/gpdb,lisakowen/gpdb,xuegang/gpdb,edespino/gpdb,chrishajas/gpdb,foyzur/gpdb,0x0FFF/gpdb,foyzur/gpdb,janebeckman/gpdb,janebeckman/gpdb,kmjungersen/PostgresXL,kaknikhil/gpdb,jmcatamney/gpdb,lpetrov-pivotal/gpdb,50wu/gpdb,oberstet/postgres-xl,lpetrov-pivotal/gpdb,randomtask1155/gpdb,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,lintzc/gpdb,kaknikhil/gpdb,tangp3/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,chrishajas/gpdb,Quikling/gpdb,techdragon/Postgres-XL,ashwinstar/gpdb,yazun/postgres-xl,ashwinstar/gpdb,lintzc/gpdb,ashwinstar/gpdb,CraigHarris/gpdb,Chibin/gpdb,zaksoup/gpdb,Chibin/gpdb,rvs/gpdb,xinzweb/gpdb,randomtask1155/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,royc1/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,xinzweb/gpdb,ahachete/gpdb,zeroae/postgres-xl,tangp3/gpdb,tangp3/gpdb,tangp3/gpdb,kaknikhil/gpdb,chrishajas/gpdb,ovr/postgres-xl,kmjungersen/PostgresXL,atris/gpdb,Postgres-XL/Postgres-XL,yuanzhao/gpdb,rubikloud/gpdb,edespino/gpdb,50wu/gpdb,edespino/gpdb,xinzweb/gpdb,ahachete/gpdb,50wu/gpdb,lpetrov-pivotal/gpdb,snaga/postgres-xl,xuegang/gpdb,rvs/gpdb,edespino/gpdb,zaksoup/gpdb,edespino/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,randomtask1155/gpdb,CraigHarris/gpdb,techdragon/Postgres-XL,0x0FFF/gpdb,tangp3/gpdb,xuegang/gpdb,CraigHarris/gpdb,pavanvd/postgres-xl,ovr/postgres-xl,lpetrov-pivotal/gpdb,foyzur/gpdb,tpostgres-projects/tPostgres,rvs/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,ahachete/gpdb,Chibin/gpdb,snaga/postgres-xl,zaksoup/gpdb,yuanzhao/gpdb,edespino/gpdb,postmind-net/postgres-xl,randomtask1155/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,lpetrov-pivotal/gpdb,Quikling/gpdb,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,Postgres-XL/Postgres-XL,edespino/gpdb,ashwinstar/gpdb,xuegang/gpdb,ashwinstar/gpdb,adam8157/gpdb,chrishajas/gpdb,jmcatamney/gpdb,lisakowen/gpdb,cjcjameson/gpdb,Chibin/gpdb,oberstet/postgres-xl,cjcjameson/gpdb,rvs/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,xuegang/gpdb,rvs/gpdb,atris/gpdb,randomtask1155/gpdb,rubikloud/gpdb,foyzur/gpdb,royc1/gpdb,foyzur/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,zaksoup/gpdb,pavanvd/postgres-xl,xuegang/gpdb,rvs/gpdb,rubikloud/gpdb,arcivanov/postgres-xl,50wu/gpdb,janebeckman/gpdb,edespino/gpdb,atris/gpdb,foyzur/gpdb,snaga/postgres-xl,greenplum-db/gpdb,postmind-net/postgres-xl,Quikling/gpdb,adam8157/gpdb,kaknikhil/gpdb,atris/gpdb,cjcjameson/gpdb,zaksoup/gpdb,Chibin/gpdb,Quikling/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,0x0FFF/gpdb,zaksoup/gpdb,foyzur/gpdb,kaknikhil/gpdb,rubikloud/gpdb,0x0FFF/gpdb,ovr/postgres-xl,lintzc/gpdb,kmjungersen/PostgresXL