Bug: DynamoDBProvider and AppConfigProvider surface bare KeyError text as the error message #8601

Expected Behaviour

Error messages explain what went wrong: for example Parameter 'nope' not found in table 't'.

Current Behaviour

Three places let a KeyError propagate and GetParameterError ends up with the raw key as its message: dynamodb.py:205 ('Item' when the item does not exist), dynamodb.py:233 ('sk' when an item lacks the sort attribute), appconfig.py:148 ('cfg' when the first get_latest_configuration returns an empty Configuration, for example a profile never deployed).

Code snippet

from botocore.config import Config
from botocore.stub import Stubber
from aws_lambda_powertools.utilities.parameters import DynamoDBProvider

provider = DynamoDBProvider(table_name="t", config=Config(region_name="us-east-1"))
stub = Stubber(provider.table.meta.client)
stub.add_response("get_item", {}, None)
stub.activate()

provider.get("nope")  # GetParameterError: 'Item'   expected a message that names the parameter and table

Possible Solution

Check for the missing keys explicitly and raise GetParameterError with a descriptive message in the three places.

Steps to Reproduce

Run the snippet above (it uses botocore.stub.Stubber, no AWS access needed).

Powertools for AWS Lambda (Python) version

latest

AWS Lambda function runtime

3.13

Packaging format used

PyPi

Debugging logs