Remove usage of empty function when possible

Author: alamirault

Annotation/Groups.php

@@ -37,7 +37,7 @@ public function __construct(string|array $groups)
     {
         $this->groups = (array) $groups;
 
-        if (empty($this->groups)) {
+        if (!$this->groups) {
             throw new InvalidArgumentException(sprintf('Parameter of annotation "%s" cannot be empty.', static::class));
         }
 

Normalizer/FormErrorNormalizer.php

@@ -72,7 +72,7 @@ private function convertFormChildrenToArray(FormInterface $data): array
                 'errors' => $this->convertFormErrorsToArray($child),
             ];
 
-            if (!empty($child->all())) {
+            if ($child->all()) {
                 $childData['children'] = $this->convertFormChildrenToArray($child);
             }