Take this playbook:

- hosts: mt1-dummys101
  tasks:
    - name: Install apt packages
      sudo: true
      apt: pkg={{ item }}
      with_items:
        - build-essential
        - libyaml-dev
        - python2.7-dev
        - "{{ 'silversearcher-ag' if ansible_distribution_major_version == 
'14' else '' }}"

How would I make it so that silversearcher-ag is installed only on Ubuntu 
14 and is omitted for other operating systems?

The above gives:

TASK: [Install apt packages] 
**************************************************
failed: [mt1-dummys101] => 
(item=build-essential,libyaml-dev,python2.7-dev,) => {"failed": true, 
"item": "build-essential,libyaml-dev,python2.7-dev,"}
msg: No package matching '' is available

I also tried changing the empty string `''` to `omit` but that also fails:

TASK: [Install apt packages] 
**************************************************
failed: [mt1-dummys101] => 
(item=build-essential,libyaml-dev,python2.7-dev,__omit_place_holder__07ef1633a8f8d1dc718ffb780b3f0e54d7f7b02a)
 
=> {"failed": true, "item": 
"build-essential,libyaml-dev,python2.7-dev,__omit_place_holder__07ef1633a8f8d1dc718ffb780b3f0e54d7f7b02a"}
msg: No package matching 
'__omit_place_holder__07ef1633a8f8d1dc718ffb780b3f0e54d7f7b02a' is available

Any way to do this?

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