Fix namespacedName

Author: ondrejmirtes

src/Type/Doctrine/QueryBuilder/QueryBuilderMethodDynamicReturnTypeExtension.php

@@ -210,6 +210,7 @@ private function findClassNode(string $className, array $nodes): ?Class_
 		foreach ($nodes as $node) {
 			if (
 				$node instanceof Class_
+				&& $node->namespacedName !== null
 				&& $node->namespacedName->toString() === $className
 			) {
 				return $node;