-no warning if dir does not exist

git-svn-id: https://gnunet.org/svn/gnunet@31496 140774ce-b5e7-0310-ab8b-a85725594a96
-reduce testcase output

git-svn-id: https://gnunet.org/svn/gnunet@31497 140774ce-b5e7-0310-ab8b-a85725594a96