[SCHEMATIC-210] Add attribute to nones data model#1555

GiaJordan merged 2 commits intoschematic-210-pandas-remove-noneSage-Bionetworks/schematic:schematic-210-pandas-remove-nonefrom

schematic-210-mockcomponent-nones-data-modelSage-Bionetworks/schematic:schematic-210-mockcomponent-nones-data-modelCopy head branch name to clipboard