Ternary module not working for default value

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1

##### SUMMARY
When I want to use skip the task if the extra-vars parameter is passed like default in playbook from the role

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
ansible-core

##### ANSIBLE VERSION

ansible 2.6.1
  config file = /etc/ansible/playbooks/example/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Apr 11 2018, 07:36:10) [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)]

##### CONFIGURATION

ansible 2.6.1
  config file = /etc/ansible/playbooks/example/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, Apr 11 2018, 07:36:10) [GCC 4.8.5 20150623 (Red Hat 4.8.5-28)]

##### OS / ENVIRONMENT
CentOS Linux release 7.5.1804 (Core)

##### STEPS TO REPRODUCE

roles/common/tasks/main.yml
---
- name: Reloading Service on {{ansible_hostname}}
  service:
    name: "{{ item }}"
    state: reloaded
  with_items: "{{ (servicename is defined) | ternary((servicename|default('')).split(','),[]) }}"

- name: checking the service status {{ansible_hostname}}
  service:
    name: "{{ item }}"
    state: started
  with_items: "{{ (servicename is defined) | ternary((servicename|default('')).split(','),[]) }}"

playbook.yaml
- name: checking service is skipped by default
  hosts: {{host}}
  vars_files:
    - /etc/ansible/inventories/group_vars/common.yaml
  serial: 1
  roles:
    - common

####ansible command
ansible-playbook -vv --vault-id sre@/opt/sre -i /etc/ansible/inventories/funccphosts test.yml --extra-vars "host=node1,node2 servicename="

##### EXPECTED RESULTS
I want to just skip the task of service if I am not passing any service name variable

##### ACTUAL RESULTS

TASK [common_role_ : Reloading Service on node1] ****************************
task path: /etc/ansible/roles/common_role_cow/tasks/main.yml:17
Thursday 27 September 2018  13:06:27 +0000 (0:00:00.529)       0:00:09.391 ****
fatal: [node1]: FAILED! =>
  msg: '''list object'' has no attribute ''split'''
2

Is there anyone can help on this

3

what is exactly the issue? you need to provide more information.

4

When I am passing servicename parameter as the task has to be skipped. But it is giving error

5

If you see my playbook and ansible-playbook its work fine for passing parameter but if I pass no value the task has to be skipped

6

Guies is there any update or you need any information.

7

Hello Ansible Team,

Is there any update on issue.

This is important.