Generator::sentence() can often generate an empty string with just a period.

What's happening is a bug in the following code:

  public function sentence($link = FALSE) {
    $graph = $this->random->sentences(mt_rand(60, 180));
    $explode = explode('.', $graph);
    // This $explode will always result in all of its array entries with one space at the beginning of the string, and then an always empty string as the last array value.
    $rand = array_rand($explode);
    $sentence = trim($explode[$rand]);
    if ($link) {
      $explode = explode(' ', $sentence);
      $link = [
        '#type' => 'link',
        '#title' => $explode[0],
        '#url' => $link,
        '#options' => [
          'attributes' => [],
          'html' => FALSE,
        ],
        '#text' => $explode[0],
      ];
      $explode[0] = \Drupal::service('renderer')->render($link);
      $sentence = implode(' ', $explode);
    }
    return Markup::create($sentence . '.');
  }

By changing the first explode('.', $graph) call to use preg_split('/\. ?/', $graph, -1, PREG_SPLIT_NO_EMPTY); we end up with a clean array of sentences with no empty values or leading spaces in each array value.

Automatically closed - issue fixed for 2 weeks with no activity.