tests/test-empty-dir.out

Fix confusing message from hg revert (issue332)

   % mkdir sub1
   % touch sub1/file1
   % hg add sub1/
   adding sub1/file1
   % hg rev sub1
   sub1: No such file in rev e4c586763258
   forgetting sub1/file1

321
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
sub/b not present
sub not present