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.
'ReceiveMessageWaitTimeSeconds', 'RedrivePolicy', 'VisibilityTimeout']
UNSUPPORTED_ATTRIBUTE_NAMES = [
    'DelaySeconds', 'MaximumMessageSize', 'MessageRetentionPeriod', 'Policy', 'RedrivePolicy']
QUEUE_ATTRIBUTES = {}
class ProxyListenerSQS(ProxyListener):
    def forward_request(self, method, path, data, headers):
        if method == 'OPTIONS':
            return 200
        req_data = self.parse_request_data(method, path, data)
        if req_data:
            action = req_data.get('Action', [None])[0]
            if action == 'SendMessage':
                new_response = self._send_message(path, data, req_data, headers)
                if new_response:
                    return new_response
            elif action == 'SetQueueAttributes':
                queue_url = self._queue_url(path, req_data, headers)
                self._set_queue_attributes(queue_url, req_data)
            elif action == 'DeleteQueue':
                QUEUE_ATTRIBUTES.pop(self._queue_url(path, req_data, headers), None)
            if 'QueueName' in req_data:
                encoded_data = urlencode(req_data, doseq=True) if method == 'POST' else ''
                modified_url = None
                if method == 'GET':
                    base_path = path.partition('?')[0]
                    modified_url = '%s?%s' % (base_path, urlencode(req_data, doseq=True))
                request = Request(data=encoded_data, url=modified_url, headers=headers, method=method)
                return request
        return True
    def parse_request_data(self, method, path, data):