[py]: Remove unnecessary calls to mapping .keys()

Author: symonk

py/selenium/webdriver/remote/errorhandler.py

@@ -122,7 +122,7 @@ def check_response(self, response: Dict[str, Any]) -> None:
 
                 try:
                     value = json.loads(value_json)
-                    if len(value.keys()) == 1:
+                    if len(value) == 1:
                         value = value["value"]
                     status = value.get("error", None)
                     if not status: