#58: bugfix, scan not exist index table will core
#58: bugfix, scan not exist index table will core

caijieming-baidu/mdt,bdtbd/mdt,bdtbd/mdt,bdtbd/mdt,caijieming-baidu/mdt,caijieming-baidu/mdt,caijieming-baidu/mdt,caijieming-baidu/mdt,caijieming-baidu/mdt,bdtbd/mdt,caijieming-baidu/mdt,bdtbd/mdt