Fix external extra (#4777)

* Fix empty table from externals

* Fix empty table from externals

crates/nu-command/tests/commands/run_external.rs

@@ -0,0 +1,15 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn better_empty_redirection() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            ls | each { |it| nu --testbin cococo $it.name }
+        "#
+    ));
+
+    eprintln!("out: {}", actual.out);
+
+    assert!(!actual.out.contains('2'));
+}