The double nesting causes an issue with setting a default empty list if you need to loop over this using with_items. This fixes the issue since it looks like ansible silently fails at setting the default if you use with_items: registered_var['one']['two'] where one is not set.
Added documentation for ignore_state and updated the example since you
would really only use this module if you are going to register it to a
variable.
This module lets you get information about any number of ec2 instances
in your environment. It also has the option of creating hostnames based
on the ip of your server.
