Promote content from Workbench 3.1.x to a Dgraph breaks the site - Endeca Site Down

Problem Statement:
When you run promote_content.bat|sh script site goes down immediately

Check IFCR Log :
Path: /opt/app/endeca/ToolsAndFrameworks\3.1.x/server/workspace/logs/ifcr.log
 
18.08.2015 19:49:38.641 *ERROR* [172.25.74.131 [1439945378629] GET /ifcr/sites/CRS/thesaurus.html HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught SlingException org.apache.sling.api.SlingException:
  ...
Caused by: java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "en"
    at java.net.URLDecoder.decode(URLDecoder.java:173)
    at java.net.URLDecoder.decode(URLDecoder.java:83)
    at org.apache.jsp.apps.endeca.thesaurus.html_jsp._jspService(html_jsp.java:118)
    at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
    ... 61 more

Solution:
Using a non-xml 1.0 safe character in a thesaurus entry causes the thesaurus content publish step within the promote_content process to fail. The rest of the content may succeed to be published, or the publish may fail entirely.

Obtain the following patch for Tools And Frameworks 3.1.x from support.oracle.com:

16863449: XM3.1.1: MDEX 6.4 INVALID XML CHARACTERS USED IN THESAURUS CAUSE PUBLISH FAILURE