Error adding new device (object has no attribute '_cli')

[DaveFace]

Per issue 46 on the hassio-ftms integration, there is an error from the python-pyftms library when connecting to some new devices:

Traceback (most recent call last):
  File "src/dbus_fast/message_bus.py", line 819, in dbus_fast.message_bus.BaseMessageBus._process_message
  File "/usr/local/lib/python3.14/site-packages/bleak/backends/bluezdbus/manager.py", line 1121, in _parse_msg
    watcher.on_connected_changed(new_connected)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.14/site-packages/bleak/backends/bluezdbus/client.py", line 173, in on_connected_changed
    self._disconnected_callback()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.14/site-packages/pyftms/client/client.py", line 226, in _on_disconnect
    del self._cli
        ^^^^^^^^^
AttributeError: 'Treadmill' object has no attribute '_cli'

Which in the current version tracks to line 245, or this function:

def _on_disconnect(self, cli: BleakClient) -> None:
    _LOGGER.debug("Client disconnected. Reset updaters states.")

    del self._cli
    self._updater.reset()
    self._controller.reset()

    if self._disconnect_cb:
        self._disconnect_cb(self)

And it seems to be a race condition with the self._cli attribute not being created by the _connect function. Adding a check for it seemed to resolve the issue and the integration worked:

if hasattr(self, "_cli"):
    del self._cli

But I'm not sure this is the best approach - honestly, deleting attributes on the class always seems a bit icky to me so it seems like this part should be refactored.