Fix aiohttp response serialize (#23858)

* Fix aiohttp response serialize

* Suport bytes

* Handle None

homeassistant/components/cloud/utils.py

@@ -1,13 +1,25 @@
 """Helper functions for cloud components."""
 from typing import Any, Dict
 
-from aiohttp import web
+from aiohttp import web, payload
 
 
 def aiohttp_serialize_response(response: web.Response) -> Dict[str, Any]:
     """Serialize an aiohttp response to a dictionary."""
+    body = response.body
+
+    if body is None:
+        pass
+    elif isinstance(body, payload.StringPayload):
+        # pylint: disable=protected-access
+        body = body._value.decode(body.encoding)
+    elif isinstance(body, bytes):
+        body = body.decode(response.charset or 'utf-8')
+    else:
+        raise ValueError("Unknown payload encoding")
+
     return {
         'status': response.status,
-        'body': response.text,
+        'body': body,
         'headers': dict(response.headers),
     }