validate connection name before resolve queue connection (#39751)

* validate connection name before resolve

* Update QueueManager.php

Co-authored-by: Taylor Otwell <taylor@laravel.com>

src/Illuminate/Queue/QueueManager.php

@@ -148,11 +148,17 @@ public function connection($name = null)
      *
      * @param  string  $name
      * @return \Illuminate\Contracts\Queue\Queue
+     * 
+     * @throws \InvalidArgumentException
      */
     protected function resolve($name)
     {
         $config = $this->getConfig($name);
 
+        if (is_null($config)) {
+            throw new InvalidArgumentException("The [{$name}] queue connection has not been configured.");
+        }
+
         return $this->getConnector($config['driver'])
                         ->connect($config)
                         ->setConnectionName($name);