[TASK] Unify output when no LDAP groups may be imported

Change-Id: I7980daaa137bc2fe805d05311f1b42441d54a6a8
Reviewed-on: http://review.typo3.org/32169
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>