Merge pull request #1750 from TriAnMan/fix-empty-string-translation

[Translatable] Allow to save an empty string translation

Author: l3pp4rd

lib/Gedmo/Translatable/TranslatableListener.php

@@ -633,7 +633,7 @@ private function handleTranslatableObjectUpdate(TranslatableAdapter $ea, $object
                 $translation->setContent($content);
                 // check if need to update in database
                 $transWrapper = AbstractWrapper::wrap($translation, $om);
-                if (((is_null($content) && !$isInsert) || is_bool($content) || is_int($content) || (is_string($content) && strlen($content) > 0) || !empty($content)) && ($isInsert || !$transWrapper->getIdentifier() || isset($changeSet[$field]))) {
+                if (((is_null($content) && !$isInsert) || is_bool($content) || is_int($content) || is_string($content) || !empty($content)) && ($isInsert || !$transWrapper->getIdentifier() || isset($changeSet[$field]))) {
                     if ($isInsert && !$objectId && !$ea->usesPersonalTranslation($translationClass)) {
                         // if we do not have the primary key yet available
                         // keep this translation in memory to insert it later with foreign key