Add guards for missing assessment results
Add guards for missing assessment results

thfield/somerville-teacher-tool,erose/studentinsights,studentinsights/studentinsights,jhilde/studentinsights,jhilde/studentinsights,studentinsights/studentinsights,hunterowens/somerville-teacher-tool,erose/studentinsights,studentinsights/studentinsights,hunterowens/somerville-teacher-tool,thfield/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,jamestyack/somerville-teacher-tool,thfield/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,erose/studentinsights,studentinsights/studentinsights,jamestyack/somerville-teacher-tool,hunterowens/somerville-teacher-tool,jamestyack/somerville-teacher-tool,erose/studentinsights,jhilde/studentinsights,jhilde/studentinsights