made routing an optional paramater

Author: transistive

src/Bolt.php

@@ -394,10 +394,11 @@ public function __destruct()
     /**
      * fetch the current routing table, if the message specification allows it.
      *
-     * @param array $routing
+     * @param array|null $routing
+     *
      * @return array|null
      */
-    public function route(array $routing): ?array
+    public function route(?array $routing = null): ?array
     {
         if (!method_exists($this->protocol, 'route')) {
             return null;

src/protocol/V4_3.php

@@ -16,9 +16,9 @@
  */
 class V4_3 extends V4_1
 {
-    public function route(array $routing): array
+    public function route(?array $routing = null): array
     {
-        $this->write($this->packer->pack(0x66, $routing));
+        $this->write($this->packer->pack(0x66, $routing ?? []));
 
         $signature = 0;
         $output = $this->read($signature);

tests/protocol/V4_3Test.php

@@ -29,4 +29,14 @@ public function test__construct()
         return $cls;
     }
 
+    /**
+     * @return V4_3
+     */
+    public function testRoute(): void
+    {
+        $v4_3 = $this->test__construct();
+
+        self::assertEquals([], $v4_3->route());
+    }
+
 }