fix register user.current bug

and course is show or hidden

app/views/account/register.html.erb

@@ -266,7 +266,7 @@
 <span id = 'no' style = 'display:none'>	
 	
 	<!-- modified by fq -->
-<% unless User.current.user_extensions.student_id.nil? %>
+<% unless User.current.user_extensions.nil? %>
 <%= text_field_tag :no, User.current.user_extensions.student_id, :placeholder => "请输入学号" %></span>
 <!-- <input name="no" id="no" value=<%= "#{User.current.user_extensions.student_id}" %> placeholder="请输入学号"></span> -->
 <% else %>

app/views/projects/_course_form.html.erb

@@ -229,7 +229,7 @@
 	 
 	 
 <% end %>
-<!-- <p style="margin-left:-10px;"><%= f.check_box :is_public, :style => "margin-left:10px;" %></p> -->
+<p style="margin-left:-10px;"><em style ="color: #888888;display: block;font-size: 90%;font-style: normal;"><%= f.check_box :is_public, :style => "margin-left:10px;" %><%= l(:label_public_info) %></em></p>
 <p style="display:none;"><%= f.text_field :project_type, :value => 1 %></p>