Dashboard: fix the ramping graph issue when data is only at the end
Dashboard: fix the ramping graph issue when data is only at the end

geffzhang/Opserver,GABeech/Opserver,VictoriaD/Opserver,manesiotise/Opserver,GABeech/Opserver,maurobennici/Opserver,rducom/Opserver,manesiotise/Opserver,opserver/Opserver,geffzhang/Opserver,rducom/Opserver,jeddytier4/Opserver,opserver/Opserver,manesiotise/Opserver,mqbk/Opserver,mqbk/Opserver,opserver/Opserver,maurobennici/Opserver,VictoriaD/Opserver,jeddytier4/Opserver