Add registerable to defaults.

generators/devise/templates/model.rb

@@ -1,7 +1,8 @@
 class <%= class_name %> < ActiveRecord::Base
   # Include default devise modules.
   # Others available are :lockable, :timeoutable and :activatable.
-  devise :authenticatable, :confirmable, :recoverable, :rememberable, :trackable, :validatable
+  devise :registerable, :authenticatable, :confirmable, :recoverable,
+         :rememberable, :trackable, :validatable
 
   # Setup accessible (or protected) attributes for your model
   attr_accessible :email, :password, :password_confirmation

lib/devise/models/authenticatable.rb

@@ -145,7 +145,6 @@ module Devise
         def find_for_authentication(conditions)
           find(:first, :conditions => conditions)
         end
-
       end
     end
   end