Applied fix for jira issue OFBIZ-5719 - Error to use <#if serviceParameter.value!> in setServiceParameterSync.ftl.
Thanks Wei for reporting the issue and providing the details for the fix. 

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1618537 13f79535-47bb-0310-9956-ffa450edef68