##### 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 -->

import getpass
import os
import re
import subprocess
import sys
from abc import ABCMeta, abstractmethod
from ansible.cli.arguments import option_helpers as opt_help
from ansible import constants as C
from ansible import context
from ansible.errors import AnsibleError
from ansible.inventory.manager import InventoryManager
from ansible.module_utils.six import with_metaclass, string_types
from ansible.module_utils._text import to_bytes, to_text
from ansible.parsing.dataloader import DataLoader
from ansible.parsing.vault import PromptVaultSecret, get_file_vault_secret
from ansible.plugins.loader import add_all_plugin_dirs
from ansible.release import __version__
from ansible.utils.collection_loader import AnsibleCollectionConfig
from ansible.utils.collection_loader._collection_finder import _get_collection_name_from_path
from ansible.utils.display import Display
from ansible.utils.path import unfrackpath
from ansible.utils.unsafe_proxy import to_unsafe_text
from ansible.vars.manager import VariableManager
try:
    import argcomplete
    HAS_ARGCOMPLETE = True
except ImportError:
    HAS_ARGCOMPLETE = False
display = Display()
class CLI(with_metaclass(ABCMeta, object)):