fix code

api/brand.py

@@ -55,10 +55,16 @@ class BrandInfoView(APIView):
 
         data = self.rpc['neptune/commodity/brand/info'](id_=id_).unwrap()
         classify_infos = self.rpc['neptune/commodity/classify/infos'](brand_id=id_).unwrap()
-        data['classify_infos'] = [{'id': obj.get('id'), 'cn_name': obj.get('cn_name')} for obj in classify_infos] if classify_infos else []
+        if classify_infos:
+            data['classify_infos'] = [{'id': obj.get('id'), 'cn_name': obj.get('cn_name')} for obj in classify_infos]
+        else:
+            data['classify_infos'] = []
         category_ids = self.rpc['neptune/commodity/brand/category_ids'](id_=id_).unwrap()
         category_infos = self.rpc['neptune/commodity/category/infos'](ids=category_ids).unwrap()
-        data['category_infos'] = [{'id': obj.get('id'), 'cn_name': obj.get('cn_name')} for obj in category_infos] if category_infos else []
+        if category_infos:
+            data['category_infos'] = [{'id': obj.get('id'), 'cn_name': obj.get('cn_name')} for obj in category_infos]
+        else:
+            data['category_infos'] = []
         return data