修改课程资源描述为空时提示

app/views/files/_file_description.html.erb

@@ -1,5 +1,5 @@
 <p ondblclick=show_edit_file_description('<%= file.id %>')>
-  资源描述：<% if file.description.blank? %><span style="color:#C5C5BE; cursor:pointer;" title="双击可编辑">点击添加描述</span><% else %><span style="cursor:pointer;" title="双击可编辑"><%= file.description %></span><% end %>
+  资源描述：<% if file.description.blank? %><span style="color:#C5C5BE; cursor:pointer;" title="双击可编辑">双击添加描述</span><% else %><span style="cursor:pointer;" title="双击可编辑"><%= file.description %></span><% end %>
   <%#= file.description.blank? ? "该资源暂无描述" : file.description %>
   <%= link_to image_tag("../images/signature_edit.png",width:"12px", height: "12px"), "javascript:void(0);", :onclick => "show_edit_file_description("+file.id.to_s+");"%>
 </p>