Add support for 'None' on response data

[avibhstarburst]

Description

Add support for 'None' on response data

Non-technical explanation

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* Fix possible failures when retrieving query results if the server returns empty data. ({issue}`443`)

[hashhar]

@hovaesco can you guide with how to add a unit test for this (using mocking since not easy to have isolated test case).

[hovaesco]

To write a unit test here please create mock like

trino-python-client/tests/unit/conftest.py

Line 64 in ca38d29

def sample_get_response_data():

and then see how it's used in tests

trino-python-client/tests/unit/test_client.py

Line 682 in ca38d29

def test_trino_fetch_request(mock_requests, sample_get_response_data):

[hashhar]

LGTM % comment.

[hashhar]

Thanks. Will merge after CI is done.