title: how to check if a javascript object contains null value or it itself is null
body: <p>Say I'm accessing a JavaScript Object called jso in Java and I'm using the following statement to test if it's null</p>
  
  <pre><code>if (jso == null)
  </code></pre>
  
  <p>However, this statement seems to return true when jso contains some null values, which is not what I want.</p>
  
  <p>Is there any method that can distinguish between a null JavaScript Object and a JavaScript Object that contains some null values?</p>
  
  <p>Thanks</p>