small updates to llama model class

[vibhav-vineet]

Small updates to LlamaServerlessAzureRestEndpointModel class in models.py while creating request.

[safooray]

Have you tested this? Return None from create_request, passes the None to get_response and I'm not sure how urllib.request.urlopen behaves if Request object is None.

As we discussed, please adjust this return value in a way that you can handle the situation properly in handle_request_error, and return do_return True so the request does not get attempted again.

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