Issue #3342222 by Dave Reid: Fixed Generator::sentence() can often generate an...

Issue #3342222 by Dave Reid: Fixed Generator::sentence() can often generate an empty string with just a period.

src/Generator.php

@@ -2,12 +2,12 @@
 
 namespace Drupal\styleguide;
 
+use Drupal\Component\Utility\Random;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Pager\PagerManagerInterface;
+use Drupal\Core\Render\Markup;
 use Drupal\Core\Url;
-use Drupal\Component\Utility\Random;
 use Symfony\Component\HttpFoundation\RequestStack;
-use Drupal\Core\Render\Markup;
 
 /**
  * Class Generator.
@@ -179,7 +179,7 @@ class Generator implements GeneratorInterface {
    */
   public function sentence($link = FALSE) {
     $graph = $this->random->sentences(mt_rand(60, 180));
-    $explode = explode('.', $graph);
+    $explode = preg_split('/\. ?/', $graph, -1, PREG_SPLIT_NO_EMPTY);
     $rand = array_rand($explode);
     $sentence = trim($explode[$rand]);
     if ($link) {