解决作业提交截止日期快到时，多发送一条消息的bug

app/views/users/_user_message_course.html.erb

@@ -37,7 +37,7 @@
           <li class="homepageNewsTime fl"><%= time_tag(ma.created_at).html_safe %> </li>
         </ul>
     <% end %>
-    <% if ma.course_message_type == "HomeworkCommon" %>
+    <% if ma.course_message_type == "HomeworkCommon" && ma.status.nil?%>
         <ul class="homepageNewsList fl">
           <li class="homepageNewsPortrait fl"><a href="javascript:void(0);"><%=link_to image_tag(url_to_avatar(ma.course_message.user), :width => "30", :height => "30"), user_path(ma.course_message.user) %></a></li>
           <li class="homepageNewsPubType fl"><%=link_to ma.course_message.user.lastname + ma.course_message.user.firstname + "老师", user_path(ma.course_message.user), :class => "newsBlue homepageNewsPublisher" %>