clear out altField in datepicker when field is empty
clear out altField in datepicker when field is empty


Former-commit-id: c7c0fc84a759cfe8899ab1b303a14ea8b9203d94
Former-commit-id: c6d3403d150786fbf804266d8f767c83044a3a06
mlocati/concrete5,haeflimi/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,KorvinSzanto/concrete5,concrete5/concrete5,deek87/concrete5,mainio/concrete5,MrKarlDilkington/concrete5,olsgreen/concrete5,hissy/concrete5,jaromirdalecky/concrete5,deek87/concrete5,acliss19xx/concrete5,triplei/concrete5-8,concrete5/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,hissy/concrete5,mainio/concrete5,concrete5/concrete5,acliss19xx/concrete5,triplei/concrete5-8,hissy/concrete5,mainio/concrete5,KorvinSzanto/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,hissy/concrete5,rikzuiderlicht/concrete5,acliss19xx/concrete5,olsgreen/concrete5,concrete5/concrete5,biplobice/concrete5,a3020/concrete5,mlocati/concrete5,olsgreen/concrete5,deek87/concrete5,biplobice/concrete5,triplei/concrete5-8,rikzuiderlicht/concrete5,KorvinSzanto/concrete5,biplobice/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,deek87/concrete5,haeflimi/concrete5,MrKarlDilkington/concrete5,a3020/concrete5