fix scrutinizer issues

Author: shmax

tests/Type/UserErrorsType/BasicTest.php

@@ -46,6 +46,7 @@ public function testValidationWithNoErrorCodes()
     {
         $type = UserErrorsType::create([
             'validate' => static function ($value) {
+                return $value ? 0 : 1;
             },
             'type' => Type::id(),
         ], ['upsertSku']);

tests/Type/ValidatedFieldDefinition/InputObjectValidationTest.php

@@ -101,7 +101,7 @@ protected function setUp()
                                     'type' => $this->bookAttributesInputType,
                                     'errorCodes' => ['titleOrIdRequired'],
                                     'validate' => static function (?array $bookAttributes) {
-                                        if ($bookAttributes === null) {
+                                        if (!$bookAttributes) {
                                             return 0;
                                         }