[Console] fixed unitialized properties (closes #5935)

src/Symfony/Component/Console/Input/Input.php

@@ -37,6 +37,8 @@ abstract class Input implements InputInterface
     public function __construct(InputDefinition $definition = null)
     {
         if (null === $definition) {
+            $this->arguments = array();
+            $this->options = array();
             $this->definition = new InputDefinition();
         } else {
             $this->bind($definition);