cli (pubsub): use PEP when service is not specified in error message.

libervia/cli/cmd_pubsub.py

@@ -85,8 +85,9 @@ class NodeInfo(base.CommandBase):
             )
         except BridgeException as e:
             if e.condition == "item-not-found":
+                service = self.args.service or "PEP"
                 self.disp(
-                    f"The node {self.args.node} doesn't exist on {self.args.service}",
+                    f"The node {self.args.node} doesn't exist on {service}",
                     error=True,
                 )
                 self.host.quit(C.EXIT_NOT_FOUND)