fix: improve cloud token/keys retrival (#189)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Bug Fixes**
- Enhanced the handling of empty response cases in cloud key retrieval,
ensuring default keys are applied when necessary.
- Added logging to improve debugging of the cloud key retrieval process.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

midealocal/cloud.py

@@ -193,14 +193,22 @@ async def get_keys(self, appliance_id: int) -> dict[int, dict[str, Any]]:
                 endpoint="/v1/iot/secure/getToken",
                 data=data,
             )
+            _LOGGER.debug(
+                "Response from get_keys() for appliance_id %s with method %s: %s",
+                appliance_id,
+                method,
+                response,
+            )
             if response and "tokenlist" in response:
                 for token in response["tokenlist"]:
                     if token["udpId"] == udp_id:
                         result[method] = {
                             "token": token["token"].lower(),
                             "key": token["key"].lower(),
                         }
-        result.update(default_keys)
+                break
+        if not result:
+            result.update(default_keys)
         return result
 
     @staticmethod