refactor: added isEmpty to comments; added new constants

src/QUI/ERP/Comments.php

@@ -76,6 +76,16 @@ public function serialize()
         return \json_encode($this->toArray());
     }
 
+    /**
+     * Comments are empty?
+     *
+     * @retun bool
+     */
+    public function isEmpty()
+    {
+        return empty($this->comments);
+    }
+
     /**
      * Generates a storable json representation of the list
      * Alias for serialize()

src/QUI/ERP/Constants.php

@@ -18,6 +18,22 @@ class Constants
     const PAYMENT_STATUS_DEBIT = 11;
     const PAYMENT_STATUS_PLAN = 12;
 
+    /**
+     * Order is only created
+     */
+    const ORDER_STATUS_CREATED = 0;
+
+    /**
+     * Order is posted (Invoice created)
+     * Bestellung ist gebucht (Invoice erstellt)
+     */
+    const ORDER_STATUS_POSTED = 1; // Bestellung ist gebucht (Invoice erstellt)
+
+    /**
+     * Order is canceled
+     */
+    const ORDER_STATUS_STORNO = 2; // Bestellung ist storniert
+
     /**
      * @var int
      */