WIP Coupon

Default Implementation + Unit test in order to validate the chain
- effect
- application field
- condition

core/lib/Thelia/Coupon/CouponRuleCollection.php

@@ -32,7 +32,7 @@ use Thelia\Exception\InvalidRuleException;
  * Date: 8/19/13
  * Time: 3:24 PM
  *
- * Manage a set of v
+ * Manage a set of CouponRuleInterface
  *
  * @package Coupon
  * @author  Guillaume MOREL <gmorel@openstudio.fr>
@@ -84,5 +84,15 @@ class CouponRuleCollection
         return $this;
     }
 
+    /**
+     * Check if there is at least one rule in the collection
+     *
+     * @return bool
+     */
+    public function isEmpty()
+    {
+        return isEmpty($this->rules);
+    }
+
 
 }