Uses Stephen's patch to fix "CheckOutEvents setCheckOutPages" https://issues.apache.org/jira/browse/OFBIZ-4161

There is an extra check in CheckOutEvents.setCheckOutPages that prevents an error message from being produced when no payment method is selected on the "How shall you pay" step of the checkout process. 

jleroux: and you got redirected to the order entry page, with the patch you stay on the payment method page.

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/release12.04@1488197 13f79535-47bb-0310-9956-ffa450edef68