[2.16] Fix TE traceback from NetworkConnectionBase default attributes

[s-hertel]

SUMMARY

Backport for #82954.

The traceback this fixes:

The full traceback is:
Traceback (most recent call last):
  File "/home/shertel/ansible/lib/ansible/plugins/connection/__init__.py", line 324, in __getattr__
    return self.__dict__[name]
           ~~~~~~~~~~~~~^^^^^^
KeyError: '_nonetype'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/shertel/ansible/lib/ansible/executor/task_executor.py", line 1009, in _set_plugin_options
    plugin = getattr(self._connection, '_%s' % plugin_type)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/shertel/ansible/lib/ansible/plugins/connection/__init__.py", line 332, in __getattr__
    raise AttributeError("'%s' object has no attribute '%s'" % (self.__class__.__name__, name))
AttributeError: 'Connection' object has no attribute '_nonetype'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/shertel/ansible/lib/ansible/plugins/connection/__init__.py", line 324, in __getattr__
    return self.__dict__[name]
           ~~~~~~~~~~~~~^^^^^^
KeyError: 'nonetype'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/shertel/ansible/lib/ansible/executor/task_executor.py", line 165, in run
    res = self._execute()
          ^^^^^^^^^^^^^^^
  File "/home/shertel/ansible/lib/ansible/executor/task_executor.py", line 581, in _execute
    plugin_vars = self._set_connection_options(cvars, templar)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/shertel/ansible/lib/ansible/executor/task_executor.py", line 1091, in _set_connection_options
    varnames.extend(self._set_plugin_options(plugin_type, variables, templar, task_keys))
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/shertel/ansible/lib/ansible/executor/task_executor.py", line 1012, in _set_plugin_options
    plugin = getattr(self._connection, plugin_type)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/shertel/ansible/lib/ansible/plugins/connection/__init__.py", line 332, in __getattr__
    raise AttributeError("'%s' object has no attribute '%s'" % (self.__class__.__name__, name))
AttributeError: 'Connection' object has no attribute 'nonetype'
fatal: [local]: FAILED! => {
    "msg": "Unexpected failure during module execution: 'Connection' object has no attribute 'nonetype'",
    "stdout": ""
}

(cherry picked from commit 4bddbe6)

ISSUE TYPE

• Bugfix Pull Request

ADDITIONAL INFORMATION