修复loadHistoryData中的bug
修复loadHistoryData中的bug

jiangjinjinyxt/vnpy,andrewchenshx/vnpy,akeyong/vnpy,kernelmilowill/PDMQBACKTEST,jiangjinjinyxt/vnpy,andrewchenshx/vnpy,jiangjinjinyxt/vnpy,vnpy/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,kernelmilowill/PDMQBACKTEST,bigdig/vnpy,msincenselee/vnpy,yongfuyang/vnpy,bigdig/vnpy,rrrrrr8/vnpy,kernelmilowill/PDMQBACKTEST,harveywwu/vnpy,kernelmilowill/PDMQBACKTEST,yongfuyang/vnpy,akeyong/vnpy,ujfjhz/vnpy,xcbat/vnpy,wisfern/vnpy,akeyong/vnpy,Chemcy/vnpy,xcbat/vnpy,bigdig/vnpy,ujfjhz/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,yongfuyang/vnpy,wisfern/vnpy,msincenselee/vnpy,msincenselee/vnpy,wisfern/vnpy,yongfuyang/vnpy,bigdig/vnpy,Chemcy/vnpy,xcbat/vnpy,Chemcy/vnpy,Chemcy/vnpy,wylwang/vnpy,ujfjhz/vnpy,wisfern/vnpy,wylwang/vnpy,akeyong/vnpy,kernelmilowill/PDMQBACKTEST,andrewchenshx/vnpy,ujfjhz/vnpy,harveywwu/vnpy,msincenselee/vnpy,xcbat/vnpy,wylwang/vnpy,wylwang/vnpy,andrewchenshx/vnpy,yongfuyang/vnpy,jiangjinjinyxt/vnpy,harveywwu/vnpy,ujfjhz/vnpy,wylwang/vnpy,Chemcy/vnpy,andrewchenshx/vnpy,wisfern/vnpy,vnpy/vnpy,wisfern/vnpy,jiangjinjinyxt/vnpy,rrrrrr8/vnpy,akeyong/vnpy,xcbat/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,harveywwu/vnpy