title: How to convert null strings to empty string json.net
body: <p>I'm using json.net to serialize a class that has strings, however, when it is converted to json the strings are convert to null, is there a way I could make json.net convert null strings to emtpy strings ('') and not null?</p>
  
  <p>Here is what I currently get</p>
  
  <pre><code>var client = {
  "FirstName": null,
  "LastName": null
  }
  </code></pre>
  
  <p>and I want this:</p>
  
  <pre><code>var client = {
   "FirstName": '',
   "LastName": ''
  }
  </code></pre>