fix(state): handle empty request in read provider (#6403)

src/State/Provider/ReadProvider.php

@@ -54,7 +54,7 @@ public function provide(Operation $operation, array $uriVariables = [], array $c
             return null;
         }
 
-        if (null === $filters = $request?->attributes->get('_api_filters')) {
+        if (null === ($filters = $request?->attributes->get('_api_filters')) && $request) {
             $queryString = RequestParser::getQueryString($request);
             $filters = $queryString ? RequestParser::parseRequestParams($queryString) : null;
         }

src/State/Tests/ReadProviderTest.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\State\Tests;
+
+use ApiPlatform\Metadata\GetCollection;
+use ApiPlatform\Serializer\SerializerContextBuilderInterface;
+use ApiPlatform\State\Provider\ReadProvider;
+use ApiPlatform\State\ProviderInterface;
+use PHPUnit\Framework\TestCase;
+
+class ReadProviderTest extends TestCase
+{
+    public function testWithoutRequest(): void
+    {
+        $operation = new GetCollection(read: true);
+        $provider = $this->createMock(ProviderInterface::class);
+        $provider->method('provide')->willReturn(['ok']);
+        $serializerContextBuilder = $this->createMock(SerializerContextBuilderInterface::class);
+
+        $readProvider = new ReadProvider($provider, $serializerContextBuilder);
+        $this->assertEquals($readProvider->provide($operation), ['ok']);
+    }
+}