Adds an empty placeholder web.xml file under ordermgr-js/WEB-INF to prevent a warning message at start and (hopefully) an (at least) exception with sendMailFromScreen service as reported by Jacopo on dev ML.
This issue also exits in R13.07 and is related with r1612202 

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1628937 13f79535-47bb-0310-9956-ffa450edef68