fix some issues

lib/list_tile/as_option_tile.dart

@@ -31,17 +31,15 @@ class ASOptionTile extends StatelessWidget {
 
   int get length => items!.length;
 
-  @override
-  Widget build(BuildContext context) {
-    if (this.leading != null) {
-      this.items!.insert(
-            0,
+  List<Widget> get _widgets => leading == null
+      ? (items ?? [])
+      : <Widget>[
           Container(
             alignment: Alignment.centerLeft,
             child: this.leading is String
                 ? Padding(
-                      padding: EdgeInsets.symmetric(
-                          vertical: 14.w, horizontal: 10.w),
+                    padding:
+                        EdgeInsets.symmetric(vertical: 14.w, horizontal: 10.w),
                     child: Text(
                       this.leading,
                       style: TextStyle(
@@ -52,8 +50,11 @@ class ASOptionTile extends StatelessWidget {
                   )
                 : this.leading,
           ),
-          );
-    }
+          ...(items ?? []),
+        ];
+
+  @override
+  Widget build(BuildContext context) {
     return Material(
         clipBehavior: Clip.antiAlias,
         color: kForegroundColor,