add check for tree_builder class to fix legacy graphs
add check for tree_builder class to fix legacy graphs
DoctorBud/monarch-app,monarch-initiative/monarch-app,kshefchek/monarch-app,jmcmurry/monarch-app,kshefchek/monarch-app,DoctorBud/monarch-app,kshefchek/monarch-app,jmcmurry/monarch-app,monarch-initiative/monarch-app,jmcmurry/monarch-app,DoctorBud/monarch-app,DoctorBud/monarch-app,kshefchek/monarch-app,jmcmurry/monarch-app,monarch-initiative/monarch-app,jmcmurry/monarch-app,DoctorBud/monarch-app,kshefchek/monarch-app,monarch-initiative/monarch-app,monarch-initiative/monarch-app