修复课程坐下下，提示内容的表达形式

app/views/student_work/_show.html.erb

@@ -59,9 +59,14 @@
 
       <li >
         <span class="tit_fb ">内容：</span>
-        <div class="showHworkP break_word upload_img" id="student_work_img_<%=work.id %>">
-          <%= work.description.html_safe if work.description%>
-        </div>
+        <% com_contents = work.work_status %>
+        <%  if com_contents != 0  && work.description %>
+            <div class="showHworkP break_word upload_img" id="student_work_img_<%= work.id %>">
+              <%= work.description.html_safe if work.description%>
+            </div>
+        <% else %>
+            <span style="color: #999999">该作品未在线下完成提交</span>
+        <% end %>
         <div class="cl"></div>
       </li>
       <li >