Fixed problem in ticket #3212 - have to test #1718 again

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25071 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Corner[ <Conic section> ] command

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25072 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e