command open returns error when does not have parameters (#7048) (#7058)

test

Co-authored-by: Ricardo Monteiro <ricardo.monteiro@getmanta.com>

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

@@ -299,3 +299,15 @@ fn open_ignore_ansi() {
         assert!(actual.err.is_empty());
     })
 }
+
+#[test]
+fn open_no_parameter() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats",
+        r#"
+            open
+        "#
+    );
+
+    assert!(actual.err.contains("needs filename"));
+}