OPEN - issue SPAGOBI-1774: In the lov preview the timestamp columns are displayed with null value 
https://www.spagoworld.org/jira/browse/SPAGOBI-1774 (RESTORE THE PREVIOUS VERSION)

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@23126 99afaf0d-6903-0410-885a-c66a8bbb5f81
improved tests

git-svn-id: svn://svn.forge.objectweb.org/svnroot/spagobi@23127 99afaf0d-6903-0410-885a-c66a8bbb5f81