Misleading return type definition for table.get_item()

[pavlobielousov]

Describe the bug
The current TypedDict definition for the DynamoDB table get_item() method GetItemOutputTableTypeDef contains "Item" as a required key, however, this is not true. According to the AWS documentation:

If there is no matching item, GetItem does not return any data and there will be no Item element in the response.

Currently, mypy reports any branch of code that questions the existence of the "Item" key as an unreachable code.

To Reproduce
Steps to reproduce the behavior:

1. Install boto3-stubs[dynamodb]
2. Run mypy on the following code sample

import boto3

db = boto3.resource("dynamodb")
table = db.Table("table-name")
response = table.get_item(Key={"foo": "bar"})

if "Item" in response:
    ...
else:
    # unreachable code according to mypy
    ...
...

Actual output

.../main.py:10: error: Statement is unreachable  [unreachable]

Expected output

No mypy reported errors.

Additional context
Windows 11, boto3-stubs installatalled via pipenv, boto3 version 1.34.19

[vemel]

Hello! Thank you for the report. I am currently working on optional keys in response StructureShapes. This looks related to #238

[vemel]

The issue has finally been fixed in mypy_boto3_builder 7.24.0 release. I have also released mypy-boto3-dynamodb 1.34.91 with the fix included. Please update and let me know if it works as expected.