Remove redundant isNotEmpty checking.

Author: yujunetee

example/lib/customs/pickers/directory_file_asset_picker.dart

@@ -703,9 +703,7 @@ class FileAssetPickerBuilder
   ) {
     int currentIndex = index;
 
-    if (prependSpecialItems.isNotEmpty) {
-      currentIndex = index - prependSpecialItems.length;
-    }
+    currentIndex = index - prependSpecialItems.length;
 
     final File asset = currentAssets.elementAt(currentIndex);
     final Widget builder = imageAndVideoItemBuilder(

lib/src/delegates/asset_picker_builder_delegate.dart

@@ -1440,9 +1440,7 @@ class DefaultAssetPickerBuilderDelegate
 
     int currentIndex = index;
 
-    if (prepandSpecialItemModels.isNotEmpty) {
-      currentIndex = index - prepandSpecialItemModels.length;
-    }
+    currentIndex = index - prepandSpecialItemModels.length;
 
     if (currentPathEntity == null) {
       return const SizedBox.shrink();
@@ -1573,9 +1571,8 @@ class DefaultAssetPickerBuilderDelegate
   }) {
     int index = assets.indexWhere((AssetEntity e) => e.id == id);
 
-    if (prependSpecialItems.isNotEmpty) {
-      index += prependSpecialItems.length;
-    }
+    index += prependSpecialItems.length;
+
     index += placeholderCount;
     return index;
   }