Sanitize params for when we get weird objects

Was having this problem with importing data from the twitter API.  It sometimes returns Twitter::NullObject objects.  I think that they're built with naught:

https://github.com/avdi/naught

Unfortunately you can't even do object.is_a?(::Twitter::NullObject), but I think that this solution will be nice in general.  Can you think of any other sorts of objects that would go into params aside from these?