title: Flutter - Calling setState() without new data
body: <p>I'm somewhat new to flutter and my question is more philosophical. When using setState(), is it bad practice to call it without using new data in the method? Ex: I call it like this:</p>
  <pre><code>setState({});
  </code></pre>
  <p>If there's a better way to refresh the build function or is this the best way?</p>