<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Explain the problem briefly below -->
The module asa_acl crashes due to returning an undefined reference `acl_name` when the lines parameter is an empty array.

##### ISSUE TYPE
- Bug Report

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

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.8.5
  config file = None
  configured module search path = ['/Users/brettmitchell/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 3.7.2 (default, Jan 13 2019, 12:50:01) [Clang 10.0.0 (clang-1000.11.45.5)]
```

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

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Check out the latest version of ansible
Run module asa_acl with an empty lines array
Note that the module crashes on line 162 in `parse_acl_name` due to `UnboundLocalError: local variable 'acl_name' referenced before assignment`

<!--- Paste example playbooks or commands between quotes below -->
```yaml

```

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

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
The module should execute successfully with no operation being performed

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The module crashed

<!--- Paste verbatim command output between quotes -->
```paste below
Traceback (most recent call last):
  File \"/Users/brettmitchell/.ansible/tmp/ansible-local-234681ttsab3b/ansible-tmp-1568737374.339541-43237010518318/AnsiballZ_asa_acl.py\", line 114, in <module>
    _ansiballz_main()
  File \"/Users/brettmitchell/.ansible/tmp/ansible-local-234681ttsab3b/ansible-tmp-1568737374.339541-43237010518318/AnsiballZ_asa_acl.py\", line 106, in _ansiballz_main
    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
  File \"/Users/brettmitchell/.ansible/tmp/ansible-local-234681ttsab3b/ansible-tmp-1568737374.339541-43237010518318/AnsiballZ_asa_acl.py\", line 49, in invoke_module
    imp.load_module('__main__', mod, module, MOD_DESC)
  File \"/var/folders/h9/4gjsgyxn6kbb0pdrt9rtn0840000gn/T/ansible_asa_acl_payload_IhH99W/__main__.py\", line 222, in <module>
  File \"/var/folders/h9/4gjsgyxn6kbb0pdrt9rtn0840000gn/T/ansible_asa_acl_payload_IhH99W/__main__.py\", line 192, in main
  File \"/var/folders/h9/4gjsgyxn6kbb0pdrt9rtn0840000gn/T/ansible_asa_acl_payload_IhH99W/__main__.py\", line 162, in parse_acl_name
UnboundLocalError: local variable 'acl_name' referenced before assignment
```

#
from __future__ import absolute_import, division, print_function
__metaclass__ = type
ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}
DOCUMENTATION = """
---
module: asa_acl
version_added: "2.2"
author: "Patrick Ogenstad (@ogenstad)"
short_description: Manage access-lists on a Cisco ASA
description:
  - This module allows you to work with access-lists on a Cisco ASA device.
extends_documentation_fragment: asa
options:
  lines:
    description:
      - The ordered set of commands that should be configured in the
        section.  The commands must be the exact same commands as found
        in the device running-config.  Be sure to note the configuration
        command syntax as some commands are automatically modified by the
        device config parser.
    required: true
    aliases: [commands]
  before:
    description:
      - The ordered set of commands to push on to the command stack if
        a change needs to be made.  This allows the playbook designer