delete the icon show about course

app/views/layouts/base_courses.html.erb

@@ -52,6 +52,7 @@
 											<div class="info_font" style=" word-wrap: break-word; word-break: break-all">
 												<%= @project.name %>
 											</div> 
+											<%if User.current.login?%>
 												<% unless @course.teacher.id == User.current.id%>
 													<!-- <%= image_tag "/images/sidebar/add.png" %>
 													<%= image_tag "/images/add.png" %> -->
@@ -64,6 +65,7 @@
 													<span class="icon-fav icon"></span><span>
 												<%= watcher_link(@project, User.current) %></span></div>
 												<% end %></td>
+											<% end %>
 											
 										</tr>
 									</table>