Merge branch 'dev_aliyun' into educoder

app/controllers/managements_controller.rb

@@ -29,7 +29,7 @@ class ManagementsController < ApplicationController
   end
 
   def user_agents
-    @user_agents = UserAgent.where("user_agents.key is not  order by action_status, register_status")
+    @user_agents = UserAgent.where("user_agents.key is not null order by action_status, register_status")
     @agents_count = @user_agents.count
     limit = 20
     @agents_pages = Paginator.new @agents_count, limit, params['page'] || 1