Change null to none for Filter.null identifier, to avoid misinterpretation
Change null to none for Filter.null identifier, to avoid misinterpretation

erose/studentinsights,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,jhilde/studentinsights,studentinsights/studentinsights,codeforamerica/somerville-teacher-tool,studentinsights/studentinsights,erose/studentinsights,studentinsights/studentinsights,codeforamerica/somerville-teacher-tool,erose/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,erose/studentinsights,jhilde/studentinsights,jhilde/studentinsights