Changes for dat and time format

Impression bug when some i18n missing in impressionable object
JS bug in ad_banner edit title

app/models/asset.rb

@@ -34,10 +34,10 @@ class Asset
   protected
   
   def set_key
-    if title.new_record?
+    if title && title.new_record?
       title.key = 'title'
     end
-    if description.new_record?
+    if description && description.new_record?
       description.key = 'description'
     end
   end