create empty node of specific content type

I have an admin form for managing 3 specific content types, i want to load an empty node of the specific content type when so that i can still do

$form['conten_type_name'] = array(
		'#type' => 'textfield', //you can find a list of available types in the form api
		'#title' => t(' Name:'),
		'#size' => 20,
		'#maxlength' => 50,
		'#default_value' => $content_type->name ,
	);

I want to avoid errors and warnings related to invalid call on non object.