ENG-7929: Fix DR tuple stream serialization error.
ENG-7929: Fix DR tuple stream serialization error.

Wrong null array position, the header size already includes the null
array size.

paulmartel/voltdb,simonzhangsm/voltdb,deerwalk/voltdb,VoltDB/voltdb,deerwalk/voltdb,creative-quant/voltdb,simonzhangsm/voltdb,migue/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,migue/voltdb,flybird119/voltdb,migue/voltdb,flybird119/voltdb,deerwalk/voltdb,paulmartel/voltdb,deerwalk/voltdb,kumarrus/voltdb,creative-quant/voltdb,flybird119/voltdb,ingted/voltdb,simonzhangsm/voltdb,zuowang/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,ingted/voltdb,kumarrus/voltdb,VoltDB/voltdb,ingted/voltdb,ingted/voltdb,paulmartel/voltdb,kumarrus/voltdb,creative-quant/voltdb,ingted/voltdb,deerwalk/voltdb,VoltDB/voltdb,flybird119/voltdb,paulmartel/voltdb,wolffcm/voltdb,zuowang/voltdb,flybird119/voltdb,migue/voltdb,migue/voltdb,wolffcm/voltdb,ingted/voltdb,flybird119/voltdb,kumarrus/voltdb,deerwalk/voltdb,simonzhangsm/voltdb,creative-quant/voltdb,migue/voltdb,VoltDB/voltdb,VoltDB/voltdb,migue/voltdb,zuowang/voltdb,wolffcm/voltdb,zuowang/voltdb,zuowang/voltdb,flybird119/voltdb,kumarrus/voltdb,paulmartel/voltdb,deerwalk/voltdb,paulmartel/voltdb,wolffcm/voltdb,VoltDB/voltdb,deerwalk/voltdb,creative-quant/voltdb,wolffcm/voltdb,creative-quant/voltdb,flybird119/voltdb,kumarrus/voltdb,zuowang/voltdb,paulmartel/voltdb,simonzhangsm/voltdb,wolffcm/voltdb,wolffcm/voltdb,VoltDB/voltdb,creative-quant/voltdb,kumarrus/voltdb,ingted/voltdb,zuowang/voltdb,zuowang/voltdb,kumarrus/voltdb,paulmartel/voltdb,ingted/voltdb,simonzhangsm/voltdb,migue/voltdb