fixes #20 , Added node-name to text-formatting

command.py

@@ -929,7 +929,7 @@ class MetricShell(Cmd):
       n1 = subargs[0]
 
       if not self.simulation.routerfail(n1):
-         print("No node %s in current topology.")
+         print("No node %s in current topology." % n1)
 
    def do_simpath(self, args):
       if not self.simulation.is_active():