bug fix

Author: Ghost-chu

src/main/java/org/maxgamer/quickshop/shop/ContainerShop.java

@@ -224,7 +224,7 @@ public UUID getTaxAccount() {
         ShopTaxAccountGettingEvent event = new ShopTaxAccountGettingEvent(uuid,this);
         event.callEvent();
         uuid = event.getTaxAccount();
-        return null;
+        return uuid;
 
     }