修复分页问题

app/helpers/users_helper.rb

@@ -57,6 +57,7 @@ module UsersHelper
   def get_resource_origin attach
     type = attach.container_type
     content = attach.container
+    unless content.nil?
       case type
         when 'Course'
           result = current_time_and_term_resource content
@@ -78,6 +79,7 @@ module UsersHelper
           result = content.name
       end
     end
+  end
 
   def current_time_and_term_resource course
     str = ""