项目类消息为空导致消息列表报500

app/views/layouts/_show_messages_list.html.erb

@@ -115,7 +115,7 @@
             <%= link_to content.html_safe, { :controller=> "my",:action => "account", :flag => 1, :applied_message_id => ma.id }, :title => "系统提示：“#{ma.name}”的申请，经确认为无效的单位信息，已被删除，请重新编辑您的单位资料。谢谢！", :target => '_blank'%>
           </li>
       <% end %>
-    <% elsif ma.class == ForgeMessage %>
+    <% elsif ma.class == ForgeMessage && ma.forge_message %>
       <% if ma.forge_message_type == "AppliedProject" %>
           <li><a href="<%=settings_project_path(:id => ma.project, :tab => "members") %>" target="_blank" title="<%=ma.forge_message.user.show_name %> 申请加入项目：<%= ma.project.name%>"><span class="shadowbox_news_user"><%=ma.forge_message.user.show_name %> </span>申请加入项目：<%= ma.project.name%></a></li>
       <% elsif ma.forge_message_type == "JoinProject" %>

app/views/users/_user_message_forge.html.erb

@@ -1,4 +1,4 @@
-<% if ma.class == ForgeMessage %>
+<% if ma.class == ForgeMessage && ma.forge_message %>
     <!--申请加入项目-->
     <% if ma.forge_message_type == "AppliedProject" %>
         <ul class="homepageNewsList fl">