ENG-565: Make the error message more clear when export tables have indexes.
ENG-565: Make the error message more clear when export tables have indexes.

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