hours: allow empty input when creating
hours: allow empty input when creating

sfbrigade/linksf,ISMAELMARTINEZ/linkuk,lcomito/linksf,lcomito/linksf,ISMAELMARTINEZ/linkuk,zendesk/linksf,zendesk/copenhelp,zendesk/copenhelp,sfbrigade/linksf,zendesk/linksf,lcomito/linksf,zendesk/copenhelp,sfbrigade/linksf