[Resource] fallback locale could be null for newly created entities

src/CoreShop/Component/Resource/Model/TranslatableTrait.php

@@ -73,7 +73,7 @@ public function getTranslation(string $locale = null, bool $useFallbackTranslati
             return $translation;
         }
 
-        if ($useFallbackTranslation) {
+        if ($useFallbackTranslation && null !== $this->fallbackLocale) {
             $fallbackTranslation = $this->translations->get($this->fallbackLocale);
             if (null !== $fallbackTranslation) {
                 $this->translationsCache[$this->fallbackLocale] = $fallbackTranslation;