Ignore meaningless @IDENT@ on CONT or CONC line as detailed at http://www.tamurajones.net/IdentCONT.xhtml

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@23079 4ae1f11a-8b86-4847-b8af-ab372f36d1fd