filed a Rails Enhancement

https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/2763-question-and-serialized-attribute-methods-should-raise-activerecordmissingattributeerror

This is the patch and test case already applied to our local Rails 2.3.2 tree. It ensures we can catch an exception and reload the object when we access attributes that aren't in the cached data.