##### SUMMARY
ansible_run_tags documentation says the default is empty ("[]") at https://docs.ansible.com/ansible/latest/reference_appendices/config.html#tags-run

However when running a debug print with no tags specified, we get this output:

```
- name: print tags
  debug:
    msg: "{{ ansible_run_tags }}"
```

```
$ ansible-playbook deploy.yml
```

```

TASK [workstation : print tags] ************************************************************************************************************************************************************************************************************************************************************
task path: /home/gdevenyi/projects/lozano_ansible/roles/workstation/tasks/main.yml:4
ok: [192.168.56.104] => {
    "msg": [
        "all"
    ]
}

```

<!--- HINT: Did you know the documentation has an "Edit on GitHub" link on every page ? -->

##### ISSUE TYPE
- Documentation Report

##### COMPONENT NAME
<!--- Write the short name of the rst file, module, plugin, task or feature below, use your best guess if unsure -->
tag

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
2.9.9
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. OS version, browser, etc. -->
Ubuntu 18.04
##### ADDITIONAL INFORMATION
<!--- Describe how this improves the documentation, e.g. before/after situation or screenshots -->

<!--- HINT: You can paste gist.github.com links for larger files -->

''' find reasonable way to display text '''
        
        if not sys.stdout.isatty():
            display.display(text, screen_only=True)
        elif 'PAGER' in os.environ:
            if sys.platform == 'win32':
                display.display(text, screen_only=True)
            else:
                CLI.pager_pipe(text, os.environ['PAGER'])
        else:
            p = subprocess.Popen('less --version', shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            p.communicate()
            if p.returncode == 0:
                CLI.pager_pipe(text, 'less')
            else:
                display.display(text, screen_only=True)
    @staticmethod
    def pager_pipe(text, cmd):