Reinitialize var $datas before filling it with new user session datas,

in 1.4 branch (#LEMONLDAP-710)



git-svn-id: svn://svn.forge.objectweb.org/svnroot/lemonldap/branches/lemonldap-ng_version_1_4-bugfixes@3414 1dbb9719-a921-0410-b57f-c3a383c2c641