add hasCondition to Cart

src/Cart/Cart.php

@@ -349,6 +349,16 @@ class Cart implements Jsonable, \JsonSerializable, Arrayable{
 		return $this->getConditions()->get($conditionName);
 	}
 
+	/**
+	 * check if condition exists on the cart by its name
+	 *
+	 * @param $conditionName
+	 * @return Condition
+	 */
+	public function hasCondition($conditionName) {
+		return $this->getConditions()->has($conditionName);
+	}
+
 	/**
 	 * Get all the condition filtered by Type
 	 * Please Note that this will only return condition added on cart bases, not those conditions added