fixed null-pointer for role-less nodes, fixed reverse rule order from node-accept to role-accept
fixed null-pointer for role-less nodes, fixed reverse rule order from
node-accept to role-accept

dhalperi/batfish,batfish/batfish,arifogel/batfish,dhalperi/batfish,intentionet/batfish,arifogel/batfish,dhalperi/batfish,batfish/batfish,intentionet/batfish,batfish/batfish,intentionet/batfish,intentionet/batfish,arifogel/batfish,intentionet/batfish