remove interface fails without separators

[DanielRaapDev]

Describe the bug
We have an existing interface. That should be removed by Ansible with state: absent. When running the step fails with:

Traceback (most recent call last):
  File "/home/ansibleuser/.ansible/tmp/ansible-tmp-1739371697.0629294-164-246873301641437/AnsiballZ_pfsense_interface.py", line 107, in <module>
    _ansiballz_main()
  File "/home/ansibleuser/.ansible/tmp/ansible-tmp-1739371697.0629294-164-246873301641437/AnsiballZ_pfsense_interface.py", line 99, in _ansiballz_main
    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
  File "/home/ansibleuser/.ansible/tmp/ansible-tmp-1739371697.0629294-164-246873301641437/AnsiballZ_pfsense_interface.py", line 47, in invoke_module
    runpy.run_module(mod_name='ansible_collections.pfsensible.core.plugins.modules.pfsense_interface', init_globals=dict(_module_fqn='ansible_collections.pfsensible.core.plugins.modules.pfsense_interface', _modlib_path=modlib_path),
  File "<frozen runpy>", line 226, in run_module
  File "<frozen runpy>", line 98, in _run_module_code
  File "<frozen runpy>", line 88, in _run_code
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/modules/pfsense_interface.py", line 164, in <module>
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/modules/pfsense_interface.py", line 159, in main
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/module_utils/module_base.py", line 451, in run
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/module_utils/module_base.py", line 419, in _remove
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/module_utils/interface.py", line 337, in _pre_remove_target_elt
  File "/tmp/ansible_pfsensible.core.pfsense_interface_payload_ott_knet/ansible_pfsensible.core.pfsense_interface_payload.zip/ansible_collections/pfsensible/core/plugins/module_utils/interface.py", line 387, in _remove_all_separators
TypeError: 'NoneType' object is not iterable

Expected behavior
The interface is deleted without errors.

Environment

• What version of pfsensible.core? master 0.7.0 Commit a2f81e2
• What version of ansible? 2.15.6
• What version of pfSense? 2.7.2-RELEASE

Additional context
The code in module_utils/interface.py does not check that no separators exist:

        separators = self.pfsense.rules.find('separator')
        for interface_elt in separators:

When find() does not return anything the iteration is broken :(

[DanielRaapDev]

I created a simple PR #171 to remediate this issue.

[opoplawski]

This was the same as #35