Symfony Instrumentation - fix warning if request options are not passed (#160)

Author: piotrantosik

src/HttpClientInstrumentation.php

@@ -33,7 +33,6 @@ public static function register(): void
                 ?string $filename,
                 ?int $lineno,
             ) use ($instrumentation): array {
-                $requestOptions = $params[2];
                 /** @psalm-suppress ArgumentTypeCoercion */
                 $builder = $instrumentation
                     ->tracer()
@@ -53,6 +52,8 @@ public static function register(): void
                     ->setParent($parent)
                     ->startSpan();
 
+                $requestOptions = $params[2] ?? [];
+
                 if (!isset($requestOptions['headers'])) {
                     $requestOptions['headers'] = [];
                 }