graph.vertices() works, even when the graph is empty
graph.vertices() works, even when the graph is empty

jeriksson/graphserver,graphserver/graphserver,graphserver/graphserver,brendannee/Bikesy-Backend,brendannee/Bikesy-Backend,jeriksson/graphserver,jeriksson/graphserver,jeriksson/graphserver,brendannee/Bikesy-Backend,bmander/graphserver,bmander/graphserver,brendannee/Bikesy-Backend,jeriksson/graphserver,brendannee/Bikesy-Backend