refactor: add if guard to par_cull_insignificant_data (#426)

Co-authored-by: Claude <noreply@anthropic.com>

Author: KSXGitHub

src/app/sub.rs

@@ -129,9 +129,7 @@ where
         let min_ratio: f32 = min_ratio.into();
         let (data_tree, deduplication_record) = {
             let mut data_tree = data_tree;
-            if min_ratio > 0.0 {
-                data_tree.par_cull_insignificant_data(min_ratio);
-            }
+            data_tree.par_cull_insignificant_data(min_ratio);
             if !no_sort {
                 data_tree.par_sort_by(|left, right| left.size().cmp(&right.size()).reverse());
             }

src/data_tree/retain.rs

@@ -41,6 +41,9 @@ where
     where
         Size: Into<u64>,
     {
+        if min_ratio <= 0.0 || min_ratio.is_nan() {
+            return;
+        }
         let minimal = self.size().into() as f32 * min_ratio;
         self.par_retain(|descendant, _| descendant.size().into() as f32 >= minimal);
     }