fix commit bugs

app/controllers/application_controller.rb

@@ -1,7 +1,7 @@
 class ApplicationController < ActionController::Base
   protect_from_forgery
   
-  include ParserFrontEnd, ParserBackEnd
+  include ParserFrontEnd, ParserBackEnd, ApplicationHelper
   
   layout :layout_by_resource
   

app/views/admin/assets/_asset.html.erb

@@ -10,8 +10,8 @@
 			</ul>
 		</div>
 	</td>
-	<td><%= asset.data.file.content_type %></td>
-	<td><%= number_to_human_size(asset.data.file.file_length) %></td>
+	<td><%= asset.data.file.content_type rescue nil %></td>
+	<td><%= number_to_human_size(asset.data.file.file_length) rescue nil %></td>
 	<td><%= asset.description rescue nil %></td>
 	<td>
 		<div class="label-group">