Better null check before printing.
Better null check before printing.

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