Close #154, fix block page when header < 20
Close #154, fix block page when header < 20

bitsuperlab/web_play,zhangweis/dice_web,dacsunlimited/web_play,bitsuperlab/web_play,bitsuperlab/web_play,dacsunlimited/web_play,dacsunlimited/web_play,bitshares/web_wallet,bitshares/web_wallet