Correctly handle unset values for date columns
Correctly handle unset values for date columns

ewdurbin/sentry,looker/sentry,jean/sentry,drcapulet/sentry,argonemyth/sentry,gencer/sentry,nicholasserra/sentry,fuziontech/sentry,daevaorn/sentry,zenefits/sentry,TedaLIEz/sentry,JTCunning/sentry,hongliang5623/sentry,gg7/sentry,Natim/sentry,JackDanger/sentry,TedaLIEz/sentry,JamesMura/sentry,boneyao/sentry,imankulov/sentry,ifduyue/sentry,kevinastone/sentry,ifduyue/sentry,korealerts1/sentry,hongliang5623/sentry,Kryz/sentry,rdio/sentry,JamesMura/sentry,JTCunning/sentry,alexm92/sentry,argonemyth/sentry,looker/sentry,NickPresta/sentry,looker/sentry,looker/sentry,boneyao/sentry,imankulov/sentry,imankulov/sentry,kevinlondon/sentry,gencer/sentry,JamesMura/sentry,jokey2k/sentry,korealerts1/sentry,felixbuenemann/sentry,wong2/sentry,BuildingLink/sentry,daevaorn/sentry,zenefits/sentry,beeftornado/sentry,JackDanger/sentry,beni55/sentry,beeftornado/sentry,mvaled/sentry,ewdurbin/sentry,vperron/sentry,mitsuhiko/sentry,beeftornado/sentry,alexm92/sentry,NickPresta/sentry,wujuguang/sentry,BayanGroup/sentry,looker/sentry,SilentCircle/sentry,JackDanger/sentry,llonchj/sentry,pauloschilling/sentry,1tush/sentry,ifduyue/sentry,mvaled/sentry,BuildingLink/sentry,fotinakis/sentry,camilonova/sentry,mvaled/sentry,BuildingLink/sentry,camilonova/sentry,TedaLIEz/sentry,songyi199111/sentry,1tush/sentry,songyi199111/sentry,mitsuhiko/sentry,jean/sentry,korealerts1/sentry,jokey2k/sentry,beni55/sentry,ewdurbin/sentry,SilentCircle/sentry,JamesMura/sentry,beni55/sentry,llonchj/sentry,ngonzalvez/sentry,gencer/sentry,1tush/sentry,BuildingLink/sentry,zenefits/sentry,vperron/sentry,kevinastone/sentry,drcapulet/sentry,gencer/sentry,fuziontech/sentry,daevaorn/sentry,Kryz/sentry,ngonzalvez/sentry,NickPresta/sentry,boneyao/sentry,mvaled/sentry,daevaorn/sentry,kevinlondon/sentry,felixbuenemann/sentry,jean/sentry,wong2/sentry,jean/sentry,drcapulet/sentry,mvaled/sentry,felixbuenemann/sentry,BayanGroup/sentry,Natim/sentry,fotinakis/sentry,nicholasserra/sentry,BuildingLink/sentry,kevinastone/sentry,Natim/sentry,pauloschilling/sentry,jokey2k/sentry,gg7/sentry,songyi199111/sentry,gg7/sentry,zenefits/sentry,rdio/sentry,pauloschilling/sentry,argonemyth/sentry,nicholasserra/sentry,vperron/sentry,Kryz/sentry,wujuguang/sentry,ifduyue/sentry,ngonzalvez/sentry,NickPresta/sentry,llonchj/sentry,rdio/sentry,zenefits/sentry,SilentCircle/sentry,hongliang5623/sentry,wujuguang/sentry,camilonova/sentry,jean/sentry,BayanGroup/sentry,fuziontech/sentry,mvaled/sentry,JTCunning/sentry,alexm92/sentry,SilentCircle/sentry,rdio/sentry,gencer/sentry,JamesMura/sentry,fotinakis/sentry,kevinlondon/sentry,ifduyue/sentry,wong2/sentry,fotinakis/sentry