[Console] fixed unitialized properties (closes symfony#5935)

Author: fabpot

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);