fix small risky code

src/Bundle/ChillCustomFieldsBundle/Entity/CustomFieldsGroup.php

@@ -95,10 +95,8 @@ class CustomFieldsGroup
 
     /**
      * Get all the custom.
-     *
-     * @return Collection
      */
-    public function getActiveCustomFields()
+    public function getActiveCustomFields(): array
     {
         if (null === $this->activeCustomFields) {
             $this->activeCustomFields = [];
@@ -143,15 +141,11 @@ class CustomFieldsGroup
 
     /**
      * Get name.
-     *
-     * @param mixed|null $language
-     *
-     * @return array
      */
-    public function getName($language = null)
+    public function getName(?string $language = null): string|array
     {
         //TODO set this in a service, PLUS twig function
-        if ($language) {
+        if (null !== $language) {
             if (isset($this->name[$language])) {
                 return $this->name[$language];
             }