4687: global name 'warn' is not defined

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@21708 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
4687: missing content migration...

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@21709 4ae1f11a-8b86-4847-b8af-ab372f36d1fd