add is_hidden didn't show on json

app/controllers/admin/bulletins_controller.rb

@@ -19,6 +19,8 @@ class Admin::BulletinsController < ApplicationController
     end
     
     bulletins = bulletins.where(:is_hot => params[:is_hot]) if !params[:is_hot].blank?
+    bulletins = bulletins.where(:is_hidden => false)
+    
     bulletins = bulletins.where(:category_id.in => params[:categories]) if !params[:categories].blank?
     bulletins = bulletins.where(:tagged_ids.in => params[:tags]) if !params[:tags].blank?
     bulletins = bulletins.where(:is_preview.in=>[false,nil])