Report charts: handle empty keys in 2dim numeric chart. (transferred from ManageIQ/manageiq@97ceb99e0e4225e0577e7f5678bbe8eb83e58008)
Report charts: handle empty keys in 2dim numeric chart.
(transferred from ManageIQ/manageiq@97ceb99e0e4225e0577e7f5678bbe8eb83e58008)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic