title: How to check against an empty JSON
body: <p>I am using <a href="https://circe.github.io/circe/" rel="nofollow noreferrer">https://circe.github.io/circe/</a> and would like to figure out, if a property has an empty JSON object or not.
  For example: </p>
  
  <pre><code>val json: String = """
    {
      "id": "c730433b-082c-4984-9d66-855c243266f0",
      "name": "Foo",
      "counts": [1, 2, 3],
      "values": {
      }
    }
  """  
  </code></pre>
  
  <p>As you can see on the code above, the property <code>values</code> is an empty JSON structure.<br>
  How to validate, if a property is empty or not? </p>