guard $argv + $token against null, preventing unnecessary exceptions

Author: bilogic

Input/ArgvInput.php

@@ -49,9 +49,7 @@ class ArgvInput extends Input
      */
     public function __construct(array $argv = null, InputDefinition $definition = null)
     {
-        if (null === $argv) {
-            $argv = $_SERVER['argv'];
-        }
+        $argv = $argv ?? $_SERVER['argv'] ?? [];
 
         // strip the application name
         array_shift($argv);