##### SUMMARY
When i want to use specific tag in playbook from role it will run all task
which is defined in 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
```yaml
roles/common/tasks/main.yml
---
- name: Reloading Service on {{ansible_hostname}}
service:
name: "{{ item }}"
state: reloaded
with_items: {{ servicename.split(',') | default([]) }}
- name: checking the service status {{ansible_hostname}}
service:
name: "{{ item }}"
state: started
with_items: {{ servicename.split(',') | default([]) }}
```
```YAML
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"
##### EXPECTED RESULTS
i wants to just skip the task of service if i am not passing any
servicename 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'''
```
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