Fixed 'object not found' error

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/datatable@1211 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
More savetl defending.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/datatable@1212 edb9625f-4e0d-4859-8d74-9fd3b1da38cb