修改bug<项目--讨论区：不登录状态下讨论区的帖子是不能进行回复等操作的，建议直接跳转到登录窗口或给出相关提示信息>

Signed-off-by: alan <547533434@qq.com>

app/views/messages/_course_show.html.erb

@@ -106,7 +106,11 @@
         <%= authoring @topic.created_on, @topic.author %>
       </div>
       <div style="float: right">
-        <%= toggle_link l(:button_reply), "reply", :focus => 'message_content' %>
+        <% if User.current.logged? %>
+            <%= toggle_link l(:button_reply), "reply", :focus => 'message_content' %>
+        <% else %>
+            <%= link_to l(:button_reply), signin_path %>
+        <% end %>
       </div>
     </div>
   </div>

app/views/messages/_project_show.html.erb

@@ -111,7 +111,11 @@
         <%= authoring @topic.created_on, @topic.author %>
       </div>
       <div style="float: right">
-        <%= toggle_link l(:button_reply), "reply", :focus => 'message_content' %>
+        <% if User.current.logged? %>
+            <%= toggle_link l(:button_reply), "reply", :focus => 'message_content' %>
+        <% else %>
+            <%= link_to l(:button_reply), signin_path %>
+        <% end %>
       </div>
     </div>
   </div>