Update aws_lambda_powertools/utilities/data_classes/cognito_user_pool_event.py

Co-authored-by: Leandro Damascena <[email protected]>
Signed-off-by: Stéphane MENG <[email protected]>

Author: knightmre

aws_lambda_powertools/utilities/data_classes/cognito_user_pool_event.py

@@ -568,8 +568,8 @@ def claims_to_suppress(self, value: List[str]):
         self._data["claimsToSuppress"] = value
 
     @property
-    def scopes_to_add(self) -> Optional[List[str]]:
-        return self.get("scopesToAdd")
+    def scopes_to_add(self) -> List[str]:
+        return self.get("scopesToAdd") or []
 
     @scopes_to_add.setter
     def scopes_to_add(self, value: List[str]):