Fixes for nil parameters in events
Fixes for nil parameters in events

mzgnr/gxui,UIKit0/gxui,henrikhodne/gxui,CodyGuo/gxui,henrylee2cn/gxui,Drahoslav7/gxui,Anaminus/gxui,google/gxui,abadojack/gxui,MeGaPk/gxui,jmptrader/gxui,treejames/gxui,cainiaocome/gxui,leelib/gxui,xinhuang327/gxui,rnubel/gxui,ylong/gxui,pombredanne/gxui,insionng/gxui