WW-3068 Make ExecAndWait interceptor create a FreeMarkerResult and use it to render the temporary page, instead of adding a fake result to the config (which causes an exception)

      git-svn-id: https://svn.apache.org/repos/asf/struts/struts2/trunk@760997 13f79535-47bb-0310-9956-ffa450edef68