Update eventEngine.py
Update eventEngine.py

fix a minor bug
bigunagi/vnpy,andrewchenshx/vnpy,harveywwu/vnpy,bigdig/vnpy,andrewchenshx/vnpy,lukesummer/vnpy,smther/vnpy,rrrrrr8/vnpy,xcbat/vnpy,yongfuyang/vnpy,Chemcy/vnpy,ujfjhz/vnpy,wisfern/vnpy,wisfern/vnpy,jiangjinjinyxt/vnpy,jiangjinjinyxt/vnpy,molebot/vnpy,wylwang/vnpy,wylwang/vnpy,akeyong/vnpy,yongfuyang/vnpy,kernelmilowill/PDMQBACKTEST,vnpy/vnpy,leechor/vnpy,wisfern/vnpy,xcbat/vnpy,harveywwu/vnpy,molebot/vnpy,freeitaly/Trading-System,akeyong/vnpy,msincenselee/vnpy,lukesummer/vnpy,rrrrrr8/vnpy,rrrrrr8/vnpy,kernelmilowill/PDMQBACKTEST,kernelmilowill/PDMQBACKTEST,bigdig/vnpy,lukesummer/vnpy,bigunagi/vnpy,ujfjhz/vnpy,andrewchenshx/vnpy,rrrrrr8/vnpy,harveywwu/vnpy,smther/vnpy,harveywwu/vnpy,bigunagi/vnpy,akeyong/vnpy,bigdig/vnpy,xcbat/vnpy,ujfjhz/vnpy,jiangjinjinyxt/vnpy,rrrrrr8/vnpy,yongfuyang/vnpy,molebot/vnpy,xcbat/vnpy,leechor/vnpy,leechor/vnpy,smther/vnpy,wylwang/vnpy,akeyong/vnpy,Chemcy/vnpy,ujfjhz/vnpy,border/vnpy,jiangjinjinyxt/vnpy,lukesummer/vnpy,xcbat/vnpy,yongfuyang/vnpy,msincenselee/vnpy,lukesummer/vnpy,harveywwu/vnpy,molebot/vnpy,wisfern/vnpy,bigdig/vnpy,rrrrrr8/vnpy,border/vnpy,Chemcy/vnpy,Chemcy/vnpy,border/vnpy,smther/vnpy,Chemcy/vnpy,leechor/vnpy,vnpy/vnpy,wisfern/vnpy,wylwang/vnpy,wisfern/vnpy,yongfuyang/vnpy,smther/vnpy,freeitaly/Trading-System,jiangjinjinyxt/vnpy,andrewchenshx/vnpy,ujfjhz/vnpy,leechor/vnpy,bigunagi/vnpy,freeitaly/Trading-System,freeitaly/Trading-System,freeitaly/Trading-System,wylwang/vnpy,molebot/vnpy,border/vnpy,bigunagi/vnpy,msincenselee/vnpy,harveywwu/vnpy,akeyong/vnpy,msincenselee/vnpy,kernelmilowill/PDMQBACKTEST,kernelmilowill/PDMQBACKTEST,border/vnpy,andrewchenshx/vnpy