Friendly error message for access beyond end (#6944)

Adds `ShellError::AccessEmptyContent`

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

@@ -199,11 +199,17 @@ fn errors_fetching_by_index_out_of_bounds() {
             "#
         ));
 
-        assert!(actual.err.contains("Row number too large (max: 3)"),);
+        assert!(actual.err.contains("Row number too large (max: 2)"),);
         assert!(actual.err.contains("too large"),);
     })
 }
 
+#[test]
+fn errors_fetching_by_accessing_empty_list() {
+    let actual = nu!(cwd: ".", pipeline(r#"[] | get 3"#));
+    assert!(actual.err.contains("Row number too large (empty content)"),);
+}
+
 #[test]
 fn quoted_column_access() {
     let actual = nu!(