fix card level add default

api/views/topic.py

@@ -13,7 +13,7 @@ class CreateTopicForBatch(BaseView):
     def post(self, request):
 
         user_id = request.POST.get("user_id", 0)
-        card_level = request.POST.get("card_level")
+        card_level = request.POST.get("card_level", 0)
         tag_id = request.POST.get("tag_id")
         is_online = request.POST.get("is_online", 0)
         topic_list = json.loads(request.POST.get("topic_list", '[]'))