Revision 882516

Should fix an issue reported by Albert Mayo at "not able to add item to created order with 1 ship group" (https://issues.apache.org/jira/browse/OFBIZ-3214) - OFBIZ-3214
If there is only 1 ship group, there is a missing parameter named "shipGroupSeqId" in the appendorderitem.ftl form. The service this form calls, appendOrderItem, requires a shipGroupSeqId parameter.

The trunk version has it fixed by adding the following code at the top, but version 4.0 does not have a fix. The trunk version was fixed on revision 658036.

I added the suggsted snippet by hand, because r658036 s doing much more.