Merge pull request #407 from Guite/master

allow null values in CheckMissingCommand

Author: Olivier Dolbeau

Command/CheckMissingCommand.php

@@ -134,8 +134,8 @@ private function countEmptyTranslations(MessageCatalogueInterface $catalogue): i
         foreach ($catalogue->getDomains() as $domain) {
             $emptyTranslations = \array_filter(
                 $catalogue->all($domain),
-                function (string $message): bool {
-                    return '' === $message;
+                function (string $message = null): bool {
+                    return null === $message || '' === $message;
                 }
             );