fix: ensure device serial number and product model are provided when creating Q7PropertiesApi

Author: allenporter

roborock/devices/traits/b01/q7/__init__.py

@@ -21,6 +21,7 @@
 from roborock.devices.rpc.b01_q7_channel import MapRpcChannel, send_decoded_command
 from roborock.devices.traits import Trait
 from roborock.devices.transport.mqtt_channel import MqttChannel
+from roborock.exceptions import RoborockException
 from roborock.protocols.b01_q7_protocol import B01_Q7_DPS, CommandType, ParamsType, Q7RequestMessage, create_map_key
 from roborock.roborock_message import RoborockB01Props
 from roborock.roborock_typing import RoborockB01Q7Methods
@@ -175,5 +176,9 @@ async def send(self, command: CommandType, params: ParamsType) -> Any:
 
 def create(product: HomeDataProduct, device: HomeDataDevice, channel: MqttChannel) -> Q7PropertiesApi:
     """Create traits for B01 Q7 devices."""
-    map_rpc_channel = MapRpcChannel(channel, map_key=create_map_key(serial=device.sn or "", model=product.model or ""))
+    if device.sn is None or product.model is None:
+        raise RoborockException(
+            f"Device serial number and product model are required (sn:: {device.sn}, model: {product.model})"
+        )
+    map_rpc_channel = MapRpcChannel(channel, map_key=create_map_key(serial=device.sn, model=product.model))
     return Q7PropertiesApi(channel, device=device, product=product, map_rpc_channel=map_rpc_channel)