Bug 1165616 - XLS decision table screen does not show up if the xls file does not meet the XLS-DT requirements

(cherry picked from commit a01c50f46080af9625c837da0303fe3bf15d9e5f)
kie-eap-integration/kie-eap-modules/kie-eap-static-modules/org-apache-commons-httpclient
-too eager to commit everything

(cherry picked from commit 09d3a6af2725c8642c317685a08e33b78a876bee)