RHEL 5 NFSv4 ACLs cannot be set properly using pipe if empty fields exist in the output of nfs4_getfacl

Issue

• nfs4 acls cannot be set properly with pipe if empty fields exists.

• nfs4_getfacl foo | nfs4_setfacl -S - bar gives the following error when empty field exists in 'nfs4_getfacl foo':

  # nfs4_getfacl foo
  A::OWNER@:rwaxtTcCy
  D::OWNER@:
  A:g:GROUP@:rtcy
  D:g:GROUP@:waxTC
  A::EVERYONE@:rtcy
  D::EVERYONE@:waxTC

  # nfs4_getfacl foo | nfs4_setfacl --set-file=- bar
  Scanning ACE string 'D::OWNER@:' failed.
  Failed while inserting ACE(s).