title: Zappa Certify Issue
body: <p>I've been having issues with deploying a domain I recently transferred from godaddy to AWS. </p>
  
  <p>Here's the zappa settings:</p>
  
  <pre><code>{
  "staging": {
      "app_function": "__init__.app",
      "aws_region": "ap-southeast-2",
      "profile_name": "default",
      "s3_bucket": "zappa-flowersapp",
      "domain": "minnidesign.com",
      "certificate_arn": "arn:aws:acm:us-east-1:985294012425:certificate/a8740ef0-0d99-4355-ac99-210ead89b743"
      }
  }
  </code></pre>
  
  <p>On running zappa certify the first time I get this error:   </p>
  
  <pre><code>params[name] = orig_value.split('/')[-1]
  AttributeError: 'NoneType' object has no attribute 'split'
  </code></pre>
  
  <p>The second time I am getting this error:</p>
  
  <pre><code>raise error_class(parsed_response, operation_name)
  BadRequestException: An error occurred (BadRequestException) when calling the CreateDomainName operation: The domain name you provided already exists.
  </code></pre>
  
  <p>I have no idea why this is happening, I have never had this kind of issue with Zappa. (When I go to minnidesign.com there is a server not found error).</p>
  
  <p>Does anyone know a solution to this problem? Many thanks in advance!</p>