bugfix：1. getlasttick 空数据判断失误导致后续分析异常 2. gethisbar 日期关键字更改为tradingday  上述修复全部测试通过
bugfix：1. getlasttick 空数据判断失误导致后续分析异常 2. gethisbar 日期关键字更改为tradingday  上述修复全部测试通过

vnpy/vnpy,msincenselee/vnpy,jiangjinjinyxt/vnpy,xcbat/vnpy,harveywwu/vnpy,bigdig/vnpy,rrrrrr8/vnpy,wisfern/vnpy,harveywwu/vnpy,wisfern/vnpy,xcbat/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,jiangjinjinyxt/vnpy,msincenselee/vnpy,wisfern/vnpy,harveywwu/vnpy,jiangjinjinyxt/vnpy,rrrrrr8/vnpy,wisfern/vnpy,msincenselee/vnpy,wisfern/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,jiangjinjinyxt/vnpy,andrewchenshx/vnpy,xcbat/vnpy,andrewchenshx/vnpy,xcbat/vnpy,wisfern/vnpy,bigdig/vnpy,bigdig/vnpy,jiangjinjinyxt/vnpy,xcbat/vnpy,harveywwu/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,vnpy/vnpy,rrrrrr8/vnpy,bigdig/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,harveywwu/vnpy