when position is null all new items get inserted in position 1

[cdcdcd123]

I'm using 'remove_from_list' and a deleted_at attribute to remove items from list. The problem is that when creating a new record, if there are other records in the list with position of null, all new records get set to position 1. A workaround I've used is to set a default scope of :conditions => (:position ^ nil), but it seems to me at least, that the private method 'bottom_item' should have a default condition of position not nil.

[amerine]

@cdcdcd123 Can you please open this issue over at https://github.com/swanandp/acts_as_list ? That is the new home for this library.