FT-93 Fix another bug, add a sanity check after split/append/deserialize to help catch these in the future
FT-93 Fix another bug, add a sanity check after split/append/deserialize
to help catch these in the future

davidl-zend/zenddbi,ollie314/server,percona/PerconaFT,BohuTANG/ft-index,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,natsys/mariadb_10.2,BohuTANG/ft-index,ottok/PerconaFT,ollie314/server,natsys/mariadb_10.2,kuszmaul/PerconaFT,davidl-zend/zenddbi,davidl-zend/zenddbi,percona/PerconaFT,kuszmaul/PerconaFT,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,ollie314/server,ottok/PerconaFT,ollie314/server,davidl-zend/zenddbi,natsys/mariadb_10.2,kuszmaul/PerconaFT,kuszmaul/PerconaFT-tmp,natsys/mariadb_10.2,flynn1973/mariadb-aix,davidl-zend/zenddbi,ollie314/server,natsys/mariadb_10.2,ollie314/server,ottok/PerconaFT,percona/PerconaFT,natsys/mariadb_10.2,BohuTANG/ft-index,natsys/mariadb_10.2,kuszmaul/PerconaFT-tmp,flynn1973/mariadb-aix,kuszmaul/PerconaFT-tmp,ottok/PerconaFT,ollie314/server,BohuTANG/ft-index,davidl-zend/zenddbi,davidl-zend/zenddbi,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,flynn1973/mariadb-aix,flynn1973/mariadb-aix,kuszmaul/PerconaFT,kuszmaul/PerconaFT-tmp,flynn1973/mariadb-aix,davidl-zend/zenddbi,slanterns/server,ollie314/server,flynn1973/mariadb-aix,flynn1973/mariadb-aix,davidl-zend/zenddbi,percona/PerconaFT,natsys/mariadb_10.2