Managed error while generating URL previews by throwing an exception

module/Common/src/Service/PreviewGeneratorInterface.php

@@ -1,6 +1,8 @@
 <?php
 namespace Shlinkio\Shlink\Common\Service;
 
+use Shlinkio\Shlink\Common\Exception\PreviewGenerationException;
+
 interface PreviewGeneratorInterface
 {
     /**
@@ -8,6 +10,7 @@ interface PreviewGeneratorInterface
      *
      * @param string $url
      * @return string
+     * @throws PreviewGenerationException
      */
     public function generatePreview($url);
 }