Update priority tasks in kernel, and avoid error in terms field

Aeria/Field/Fields/TermsField.php

@@ -15,15 +15,17 @@
 class TermsField extends SelectField
 {
     protected $original_config;
+
     /**
      * Transform the config array; note that this does not operate on
-     * `$this->config`: this way it can be called from outside
+     * `$this->config`: this way it can be called from outside.
      *
-     * @param array $config    the field's config
+     * @param array $config the field's config
      *
-     * @return array        the transformed config
+     * @return array the transformed config
      */
-    public static function transformConfig(array $config) {
+    public static function transformConfig(array $config)
+    {
         $config['type'] = 'select';
 
         $taxonomy = (isset($config['taxonomy'])) ? $config['taxonomy'] : 'category';
@@ -34,19 +36,25 @@ public static function transformConfig(array $config) {
             'hide_empty' => $hide_empty,
         ));
 
-        $config['options'] = array_map(
-            function ($term) {
-                return array(
-                    'label' => $term->name,
-                    'value' => $term->term_id,
-                );
-            },
-            array_values($terms)
-        );
+        $config['options'] = [];
+
+        if (!empty($terms) && !is_wp_error($terms)) {
+            $config['options'] = array_map(
+                function ($term) {
+                    return array(
+                        'label' => $term->name,
+                        'value' => $term->term_id,
+                    );
+                },
+                array_values($terms)
+            );
+        }
 
         unset($config['taxonomy']);
+
         return parent::transformConfig($config);
     }
+
     /**
      * Constructs the field.
      *

Aeria/Kernel/Tasks/CreateTaxonomy.php

@@ -6,25 +6,24 @@
 
 /**
  * This task is in charge of creating the taxonomies.
- * 
+ *
  * @category Kernel
- * @package  Aeria
+ *
  * @author   Simone Montali <[email protected]>
  * @license  https://github.com/caffeinalab/aeria/blob/master/LICENSE  MIT license
- * @link     https://github.com/caffeinalab/aeria
+ *
+ * @see     https://github.com/caffeinalab/aeria
  */
 class CreateTaxonomy extends Task
 {
-    public $priority = 3;
+    public $priority = 1;
     public $admin_only = false;
+
     /**
      * The main task method. It registers the needed taxonomies.
      *
      * @param array $args the arguments to be passed to the Task
      *
-     * @return void
-     *
-     * @access public
      * @since  Method available since Release 3.0.0
      */
     public function do(array $args)
@@ -40,5 +39,4 @@ public function do(array $args)
             }
         }
     }
-
-}
+}