title: how to display any custom message in grid panel
body: <p>I have a requirement. </p>
  
  <ol>
  <li>suppose store is not returning data, i want to show some message in the grid panel like 'no records found' message.</li>
  <li>Another scenario if any exception comes from java side i am sending error message to the client, How can i show that message.</li>
  </ol>
  
  <p>Empty text is not working.</p>