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##### 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
```

contents = module.params['config']
    if not contents:
        contents = get_config(module)
    filtered_config = list()
    for item in contents.split('\n'):
        if item.startswith('access-list %s ' % acl_name):
            filtered_config.append(item)
    return NetworkConfig(indent=1, contents='\n'.join(filtered_config))
def parse_acl_name(module):