Fix KeyError in MQTT publish handler dropping whole status update

_on_publish_received() indexes appliance.attributes["parameters"]
directly by parName when applying an incoming appliancestatus push:

    appliance.attributes["parameters"][parameter["parName"]].update(parameter)

If the payload contains a parName that hasn't been seen/initialized
locally yet, this raises KeyError before self._hon.notify() is
reached, so the entire push message (not just that one parameter) is
silently dropped for that appliance.

In practice this reproduced reliably on a Haier washing machine
(HW90-B14959U1-UK) at end-of-cycle, where the push includes a
"programStats" parameter:

    Exception ignored in: <class 'KeyError'>
    Traceback (most recent call last):
      File ".../awscrt/mqtt5.py", line 1540, in _on_publish
        self._on_publish_cb(publish_data)
      File ".../pyhon/connection/mqtt.py", line 109, in _on_publish_received
        appliance.attributes["parameters"][parameter["parName"]].update(
    KeyError: 'programStats'

Because the exception is swallowed by the underlying MQTT client as
"Exception ignored in", it fails silently with no log entry pointing
at the cause - the visible symptom is just that dependent entities
(e.g. door-open state bundled in the same push) never update.

Fix: use setdefault() instead of a raw index so an unseen parName
initializes its entry instead of raising.

pyhon/connection/mqtt.py

@@ -86,9 +86,9 @@ class MQTTClient:
         )
         if topic and "appliancestatus" in topic:
             for parameter in payload["parameters"]:
-                appliance.attributes["parameters"][parameter["parName"]].update(
-                    parameter
-                )
+                appliance.attributes["parameters"].setdefault(
+                    parameter["parName"], {}
+                ).update(parameter)
             appliance.sync_params_to_command("settings")
         elif topic and "disconnected" in topic:
             _LOGGER.info(