Using the :latest localstack, attempts to delete an SQS queue fail with the following error logged to the console.

```localstack_1                          | 2020-02-11T19:04:08:ERROR:localstack.services.generic_proxy: Error forwarding request: 'Attribute.1.Value' Traceback (most recent call last):
localstack_1                          |   File "/opt/code/localstack/localstack/services/generic_proxy.py", line 248, in forward
localstack_1                          |     path=path, data=data, headers=forward_headers)
localstack_1                          |   File "/opt/code/localstack/.venv/lib/python3.7/site-packages/localstack_ext/services/sqs/sqs_extended.py", line 30, in forward_request
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 60, in forward_request
localstack_1                          |     self._set_queue_attributes(queue_url, req_data)
localstack_1                          |   File "/opt/code/localstack/.venv/lib/python3.7/site-packages/localstack_ext/services/sqs/sqs_extended.py", line 73, in _set_queue_attributes
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 275, in _set_queue_attributes
localstack_1                          |     attrs = self._format_attributes(req_data)
localstack_1                          |   File "/opt/code/localstack/localstack/services/sqs/sqs_listener.py", line 237, in _format_attributes
localstack_1                          |     key_value = req_data[key2][0]
localstack_1                          | KeyError: 'Attribute.1.Value'```

I'm using terraform to manage my SQS queues and the deletion was triggered by renaming the queue.
result = set()
        for i in range(1, 500):
            key = 'AttributeName.%s' % i
            if key not in req_data:
                break
            result.add(req_data[key][0])
        return result
    def _send_message(self, path, data, req_data, headers):
        queue_url = self._queue_url(path, req_data, headers)
        queue_name = queue_url.rpartition('/')[2]
        message_body = req_data.get('MessageBody', [None])[0]
        message_attributes = self.format_message_attributes(req_data)
        process_result = lambda_api.process_sqs_message(message_body, message_attributes, queue_name)
        if process_result:
            
            new_response = Response()
            message_attr_hash = self.get_message_attributes_md5(req_data)
            new_response._content = SUCCESSFUL_SEND_MESSAGE_XML_TEMPLATE.format(
                message_attr_hash=message_attr_hash,
                message_body_hash=md5(message_body),
                message_id=str(uuid.uuid4())
            )
            new_response.status_code = 200
            return new_response
    def _set_queue_attributes(self, queue_url, req_data):