Print "No items found" when there are no packages for llisting

platformio/commands/lib.py

@@ -277,6 +277,8 @@ def lib_list(ctx, json_output):
         else:
             for item in sorted(items, key=lambda i: i['name']):
                 print_lib_item(item)
+            else:
+                click.echo("No items found")
 
     if json_output:
         return click.echo(