Use None instead of '' to represent missing/null return value for get_next_hop
Use None instead of '' to represent missing/null return value for get_next_hop

jacobq/csci5221-viro-project,jacobq/csci5221-viro-project,jacobq/csci5221-viro-project,jacobq/csci5221-viro-project,jacobq/csci5221-viro-project