Fix clippy::len_zero lint style violations (#36589)

Related: #36577

Release Notes:

- N/A

---------

Signed-off-by: Umesh Yadav <git@umesh.dev>

crates/editor/src/test/editor_test_context.rs

@@ -420,7 +420,7 @@ impl EditorTestContext {
             if expected_text == "[FOLDED]\n" {
                 assert!(is_folded, "excerpt {} should be folded", ix);
                 let is_selected = selections.iter().any(|s| s.head().excerpt_id == excerpt_id);
-                if expected_selections.len() > 0 {
+                if !expected_selections.is_empty() {
                     assert!(
                         is_selected,
                         "excerpt {ix} should be selected. got {:?}",