Hello guys,

I've recently updated ansible to v1.8.1 and I'm having some issues with 
some playbooks that worked on older ansible versions.

For example I've a reusable role that manages the installation of packages 
with the following task:

- name: Install additional packages
  apt: name={{ item }} update_cache=yes
  with_items: additional_packages|default([])

Where the variable additional_packages is usually not defined, but can be 
set on a per host or per group base.
On older versions this worked as expected:

   - if additional_packages is *not* defined, default to an empty list and 
   skip the task
   - if additional_packages is defined, install the packages in the list

Now in v1.8.1 I get the following error:

TASK: [pkgs | Install additional packages] 
********************************* 
fatal: [hal9000] => with_items expects a list or a set

FATAL: all hosts have already failed -- aborting

Was this an intended change or is it a bug?

Best regards,
EP

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