title: How to put empty string in JSON_OBJECT_T object?
body: <p>I am trying to add an empty string to a <code>JSON_OBJECT_T</code> using the following code but I am getting <code>null</code> in value and not empty string.</p>
  
  <pre><code>DECLARE
     V_OBJ JSON_OBJECT_T;
  BEGIN
     V_OBJ := JSON_OBJECT_T();
     V_OBJ.PUT('customerAccRef','');
     DBMS_OUTPUT.PUT_LINE(V_OBJ.stringify);
  END;
  </code></pre>
  
  <p>When I do this, I am getting the following json</p>
  
  <pre><code>{"customerAccRef":null}
  </code></pre>
  
  <p>and I want output as below</p>
  
  <pre><code>{"customerAccRef":""}
  </code></pre>
  
  <p>Can someone suggest what change I need to do to pass an empty string?</p>