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.
flags = re.MULTILINE | re.DOTALL
        queue_url = self._queue_url(path, req_data, headers)
        requested_attributes = self._format_attributes_names(req_data)
        regex = r'(.*<GetQueueAttributesResult>)(.*)(</GetQueueAttributesResult>.*)'
        attrs = re.sub(regex, r'\2', content_str, flags=flags)
        for key, value in QUEUE_ATTRIBUTES.get(queue_url, {}).items():
            if (not requested_attributes or requested_attributes.intersection({'All', key})) and \
                    not re.match(r'<Name>\s*%s\s*</Name>' % key, attrs, flags=flags):
                attrs += '<Attribute><Name>%s</Name><Value>%s</Value></Attribute>' % (key, value)
        content_str = (re.sub(regex, r'\1', content_str, flags=flags) +
                       attrs + re.sub(regex, r'\3', content_str, flags=flags))
        return content_str
    def _fire_event(self, req_data, response):
        action = req_data.get('Action', [None])[0]
        event_type = None
        queue_url = None
        if action == 'CreateQueue':
            event_type = event_publisher.EVENT_SQS_CREATE_QUEUE
            response_data = xmltodict.parse(response.content)
            if 'CreateQueueResponse' in response_data:
                queue_url = response_data['CreateQueueResponse']['CreateQueueResult']['QueueUrl']
        elif action == 'DeleteQueue':
            event_type = event_publisher.EVENT_SQS_DELETE_QUEUE
            queue_url = req_data.get('QueueUrl', [None])[0]
        if event_type and queue_url:
            event_publisher.fire_event(event_type, payload={'u': event_publisher.get_hash(queue_url)})
    def _queue_url(self, path, req_data, headers):