*: add empty help_topic table (#1438)
*: add empty help_topic table (#1438)

Make mycli happy.
andelf/tidb,XuHuaiyu/tidb,c4pt0r/tidb,ngaut/tidb,c4pt0r/tidb,yuanwhy/tidb,CodeRushing/tidb,zs634134578/tidb,louishust/tidb,spongedu/tidb,ueizhou/tidb,qiuyesuifeng/tidb,mccxj/tidb,zimulala/tidb,XuHuaiyu/tidb,ngaut/tidb,8cbx/tidb,myrice/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,mccxj/tidb,kyle-wang/tidb,tiancaiamao/tidb,zimulala/tidb,c4pt0r/tidb,Cofyc/tidb,JinheLin/tidb,liyu4/tidb,silenceper/tidb,Nify/tidb,Nify/tidb,ngaut/tidb,yangwenmai/tidb,EvilMcJerkface/tidb,liyu4/tidb,simon-xia/tidb,louishust/tidb,JinheLin/tidb,coocood/tidb,anywhy/tidb,qiuyesuifeng/tidb,myrice/tidb,CodeRushing/tidb,pingcap/tidb,c4pt0r/tidb,anywhy/tidb,kyle-wang/tidb,silentred/tidb,astaxie/tidb,coocood/tidb,pingcap/tidb,wusphinx/tidb,zs634134578/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,silentred/tidb,ming-relax/tidb,Cofyc/tidb,kyle-wang/tidb,ngaut/tidb,ming-relax/tidb,gaocegege/tidb,spongedu/tidb,andelf/tidb,ueizhou/tidb,astaxie/tidb,cosmtrek/tidb,qhsong/tidb,tiancaiamao/tidb,gaocegege/tidb,wusphinx/tidb,c4pt0r/tidb,yangwenmai/tidb,yuanwhy/tidb,8cbx/tidb,kyle-wang/tidb,silenceper/tidb,cosmtrek/tidb,EvilMcJerkface/tidb,ngaut/tidb,kyle-wang/tidb,simon-xia/tidb,qhsong/tidb,kyle-wang/tidb