title: Laravel $e->getMessage empty on Request validation error
body: <p>I'm trying to setup custom error handlers in Handler.php but when I try to get the error message when a Request validation isn't met I get an empty response.</p>
  
  <pre><code>public function render($request, Exception $e)
  {
      dd($e-&gt;getMessage());
      return parent::render($request, $e);
  }
  </code></pre>
  
  <p>My rules are set to:</p>
  
  <pre><code>'min:10'
  </code></pre>
  
  <p>So when I don't provide parameters of length 10 I want it to output that error within $e->getMessage() so I can do whatever I want to do with it, but the error is always empty. What am i doing wrong?</p>