Bugfix undefined variable attributes

Author: emsifa

src/Validation.php

@@ -105,6 +105,8 @@ protected function parseArrayAttribute(Attribute $attribute)
             $data, $attributeKey
         ));
 
+        $attributes = [];
+
         foreach ($data as $key => $value) {
             if ((bool) preg_match('/^'.$pattern.'\z/', $key)) {
                 $attr = new Attribute($this, $key, null, $attribute->getRules());
@@ -411,4 +413,4 @@ protected function resolveInputAttributes(array $inputs)
         return $resolvedInputs;
     }
 
-}
+}