总得分的提示为空的显示为0

app/views/courses/_new_member_list.html.erb

@@ -102,12 +102,12 @@
             <span style="top: 75px;"></span>
             <p >
                 <font class="fb"><%= user.show_name %></font><br/>
-                资源&nbsp;&nbsp;&nbsp;&nbsp;发布数：<%= member.resource_num %><br/>
-                <font class="mr15">问答&nbsp;&nbsp;&nbsp;&nbsp;发布数：<%= member.message_num %></font>回复数：<%= member.message_reply_num %><br/>
-                <font class="mr15">通知&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.news_num %></font>留言数：<%= member.news_reply_num %><br/>
-                <font class="mr15">作业&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.homework_num %></font>留言数：<%= member.homework_journal_num %><br/>
-                班级&nbsp;&nbsp;&nbsp;&nbsp;留言数：<%= member.journal_num %><br />
-                测验&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.exercise_num %>
+                资源&nbsp;&nbsp;&nbsp;&nbsp;发布数：<%= member.resource_num.nil? ? 0 : member.resource_num %><br/>
+                <font class="mr15">问答&nbsp;&nbsp;&nbsp;&nbsp;发布数：<%= member.message_num.nil? ? 0 : member.message_num %></font>回复数：<%= member.message_reply_num.nil? ? 0 : member.message_reply_num %><br/>
+                <font class="mr15">通知&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.news_num.nil? ? 0 : member.news_num %></font>留言数：<%= member.news_reply_num.nil? ? 0 : member.news_reply_num %><br/>
+                <font class="mr15">作业&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.homework_num.nil? ? 0 : member.homework_num %></font>留言数：<%= member.homework_journal_num.nil? ? 0 : member.homework_journal_num %><br/>
+                班级&nbsp;&nbsp;&nbsp;&nbsp;留言数：<%= member.journal_num.nil? ? 0 : member.journal_num %><br />
+                测验&nbsp;&nbsp;&nbsp;&nbsp;提交数：<%= member.exercise_num.nil? ? 0 : member.exercise_num %>
             </p>
           </div>
         </td>