A patch from Leon for "NPE thrown out while rendering disabled menu item" https://issues.apache.org/jira/browse/OFBIZ-5451

The method "renderLink" of new class MacroMenuRenderer calls the WidgetWorker.determineAutoLinkType. When menuItem.getDisabled() is true, the link target will be set to null and NPE occurs.

jleroux: This was related with r1517353 and r1537833. The Leon's patch fixes r1517353 and this commits also reverts r1537833


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1553887 13f79535-47bb-0310-9956-ffa450edef68