title: What's the easiest way to display NULL value as empty string instead of "null" string in an ExtJS grid?
body: <p>I have a server-side script (PHP) returning JSON data to populate an ExtJS Grid.</p>
  
  <p>This data comes from a MySQL query, containing some NULL values.</p>
  
  <p>When PHP encodes it into the JSON notation, it keeps the NULL intact:</p>
  
  <pre><code>{"id":"33","name":"Test1","url":null,"cls":"x-tree-noicon","expanded":true}
  </code></pre>
  
  <p>But... when this data is displayed in the ExtJS grid, it shows a "<strong>null</strong>" string in the place of the NULL value.</p>
  
  <p>I don't want it to display "<strong>null</strong>". I just want it empty (an empty string).</p>
  
  <p>What is the easiest way to achieve this?</p>
  
  <p>Thanks.</p>