fix(rust): improve ockam relay list display when local state is empty

implementations/rust/ockam/ockam_command/src/relay/list.rs

@@ -45,8 +45,25 @@ async fn run_impl(
     let to = get_node_name(&opts.state, &cmd.to);
     let node_name = extract_address_value(&to)?;
 
-    if !opts.state.nodes.get(&node_name)?.is_running() {
-        return Err(miette!("The node '{}' is not running", node_name));
+    match opts.state.nodes.get(&node_name) {
+        Ok(node_state) => {
+            if !node_state.is_running() {
+                return Err(miette!("The node '{}' is not running", node_name));
+            }
+        }
+        Err(e) => {
+            if node_name == "default" {
+                let v: Vec<ForwarderInfo> = vec![];
+                let list = opts.terminal.build_list(
+                    &v,
+                    "Relays",
+                    "Local state is empty, there are no relays.",
+                )?;
+                opts.terminal.stdout().plain(list).write_line()?;
+                return Ok(());
+            }
+            return Err(miette!("{}", e.to_string()));
+        }
     }
 
     let mut rpc = Rpc::background(&ctx, &opts, &node_name).await?;