fix error

app/controllers/admin/asks_controller.rb

@@ -277,7 +277,9 @@ class Admin::AsksController < OrbitAdminController
       ask_setting = AskSetting.create() if ask_setting.nil?
     end
     if temp_params['custom_values'].nil?
-      temp_params['custom_values'] = {}
+      temp_params['custom_values'] = ask_setting.custom_values
+    else
+      temp_params['custom_values'] = ask_setting.custom_values.merge(temp_params['custom_values'])
     end
     ask_setting.custom_fields.select{|k,v| v['type']=='file' || v['type']=='image'}.each do |k,v|
       file = temp_params['custom_values'][k] rescue nil