#1374 修复项目--讨论区：删除帖子却返回404窗口且导航栏丢失的BUG

解决方案：删除帖子后跳转错误

app/controllers/messages_controller.rb

@@ -141,7 +141,7 @@ class MessagesController < ApplicationController
       if @message.parent
         redirect_to board_message_url(@board, @message.parent, :r => r)
       else
-        redirect_to board_message_url(@project, @board)
+        redirect_to project_boards_url(@project)
       end
     elsif @course
       if @message.parent