fix default after an empty where (#10240)

should close https://github.com/nushell/nushell/issues/10237

# Description
this is @fdncred's findings 😋 
i just made the PR 😌 

# User-Facing Changes
```nushell
[a b] | where $it == 'c' | last | default 'd'
```
now works and gives `d`


# Tests + Formatting
adds a new `default_after_empty_filter` test.

# After Submitting

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

@@ -33,3 +33,10 @@ fn adds_row_data_if_column_missing() {
         assert_eq!(actual.out, "2");
     });
 }
+
+#[test]
+fn default_after_empty_filter() {
+    let actual = nu!("[a b] | where $it == 'c' | last | default 'd'");
+
+    assert_eq!(actual.out, "d");
+}