system.getDetails api call throws null pointer after Satellite 5.6 migration

Issue

• Satellite API system namespace and getDetails method receives null pointer in XMLRPC response
• Further analysis of XMLRPC response shows null pointer returned:

<?xml version="1.0" encoding="UTF-8"?><methodResponse><params><param><value><?xml version="1.0" encoding="UTF-8"?><methodResponse><fault><value><struct><member><name>faultCode</name><value><int>-1</int></value></member><member><name>faultString</name><value><string>java.lang.NullPointerException: null</string></value