修复没有课程的学校显示bug

app/views/welcome/course.html.erb

@@ -101,7 +101,7 @@
               <h1></h1>
           <% end %>
 
-          <% find_all_new_hot_course(10, @school_id).map do |course| %>
+          <% find_all_new_hot_course(9, @school_id).map do |course| %>
               <li class='<%= cycle("odd", "even") %>' title=<%= course.description.to_s.gsub(/<\/?.*?>/,"") %>>
                 <div class='avatar'>
                   <%= image_tag(get_course_avatar(course), :class => "avatar-4") %>