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

Forgot to add the current IO position to the null array location.

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