title: How to return custom response for `Illuminate\Support\ItemNotFoundException`?
body: <p>In my controller, I used the method <code>firstOrFail()</code> for a database query with <em>Eloquent</em>. When in debug mode, I get a Laravel error message with the content <code>Illuminate\Support\ItemNotFoundException</code>.</p>
  <p>However, I'd like to return a <code>redirect()</code> or mabye <code>back()</code> instead of showing this error screen. How can I do that?</p>