Properly set empty option for defaults

Author: wkirby

carpenter.php

@@ -2,7 +2,7 @@
 
 /**
  * Plugin Name: Carpenter
- * Version: 1.2.5
+ * Version: 1.2.6
  * Author: Apsis Labs
  * Author URI: www.apsis.io
  */

core/taxonomy.cls.php

@@ -14,7 +14,7 @@ function __construct($name, $postType, $args = array()) {
         $this->slug     = isset($slug) ? $slug : $name;
         $this->singular = isset($singular) ? $singular : $this->createLabel($name);
         $this->plural   = isset($plural) ? $plural : $this->createLabel($name);
-        $this->defaults = isset($defaults) ? $defaults : null;
+        $this->defaults = isset($defaults) ? $defaults : array();
 
         $options = ( isset($options) && is_array($options) ) ? $options : array();