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.
content_str = re.sub(r'<QueueUrl>\s*http://', r'<QueueUrl>https://', content_str)
            
            external_port = SQS_PORT_EXTERNAL or get_external_port(headers, request_handler)
            content_str = re.sub(r'<QueueUrl>\s*([a-z]+)://[^<]*:([0-9]+)/([^<]*)\s*</QueueUrl>',
                                 r'<QueueUrl>\1://%s:%s/\3</QueueUrl>' % (HOSTNAME_EXTERNAL, external_port),
                                 content_str)
            
            content_str = re.sub(r'<([a-zA-Z0-9]+)>\s*arn:aws:sqs:elasticmq:([^<]+)</([a-zA-Z0-9]+)>',
                                 r'<\1>arn:aws:sqs:%s:\2</\3>' % (region_name), content_str)
            if action == 'CreateQueue':
                queue_url = re.match(r'.*<QueueUrl>(.*)</QueueUrl>', content_str, re.DOTALL).group(1)
                self._set_queue_attributes(queue_url, req_data)
        if content_str_original != content_str:
            
            new_response = Response()
            new_response.status_code = response.status_code
            new_response.headers = response.headers
            new_response._content = content_str
            new_response.headers['content-length'] = len(new_response._content)
            return new_response
    
    
    
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