title: How to map only when the field is not null in JOLT
body: <p>Here is my input :</p>
  
  <pre><code>   { "isPoolPoint": "test", "timeZone": "ET" }
  </code></pre>
  
  <p>I want output to be :</p>
  
  <pre><code>   { "address" : [{"line2": "test"}] }
  </code></pre>
  
  <p>I should not get any thing as output if <code>isPoolPoint</code> is a <code>null</code>.</p>