Handle case when first_seen and last_seen may not be set
Handle case when first_seen and last_seen may not be set

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