Projects / Lithium

###What happened:
Think I may have found a bug with the Media class when creating your own ```Media::type()``` (mine is called 'template').  In the second parameter of that function, you can supply the content type for your custom media type to use.  Well if I use ```text/html``` in that second parameter, it utilizes my custom Media type even if I don't call it by ```$this->_render['type'] = 'template'``` in the controller.  This is why I want to pass ```null``` in that second parameter. When I pass ```null``` and try to render a page through my custom Media Type I get this: ```Notice: Undefined index: template in /usr/share/lithium/libraries/lithium/net/http/Media.php on line 412```.  Maybe I am using it incorrectly and that's the reason why this is happening and sorry to waste your guys' time.  Here is my custom Media Type's code in the bootstrap:
{{{
use \lithium\net\http\Media;

Media::type('template', null, array(
    'view' => '\lithium\template\View',
    'renderer' => '\cms\extensions\adapter\view\Template',
    'paths' => array(
        'template' => '{:library}/views/{:controller}/{:template}.html.tpl',
        'layout' => '{:library}/views/layouts/{:layout}.html.tpl'
    )
));
}}}
A point of note is that my view adapter works just fine, it's just that notice that pop's up.

###What was expected:
There should be no notice on line 412 of the Media class.

###Test Case
{{{
namespace app\tests\cases\net\http;

use \lithium\net\http\Media;
use \lithium\action\Response;

class MediaTest extends \lithium\test\Unit {
	public function testCustomMediaTypeNullContentType(){
		Media::type('custom', null);
		$response = new Response();
		$response->type = 'custom';

		Media::render($response, null, array(
			'layout' => false,
			'template' => false,
			'encode' => function($data) { return $data; }
		));

		$expected = array('Content-type: text/html');
		$result = $response->headers();
		$this->assertEqual($expected, $result);
	}
}
}}}