Changed metadata task to strip out bad chars and ignore non-present columns.

tasks/paperclip_tasks.rake

@@ -48,8 +48,9 @@ namespace :paperclip do
     task :metadata => :environment do
       for_all_attachments do |instance, name|
         if file = instance.send(name).to_file
-          instance.send("#{name}_content_type=", file.content_type)
-          instance.send("#{name}_file_size=", file.size)
+          instance.send("#{name}_file_name=", instance.send("#{name}_file_name").strip.gsub(/[^\w\d\.\-]+/, '_'))
+          instance.send("#{name}_content_type=", file.content_type.strip)
+          instance.send("#{name}_file_size=", file.size) if instance.respond_to?("#{name}_file_size")
           instance.save(false)
         else
           true