make sure evalGeoGebraCAS() works from JavaScript

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24526 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.118.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24527 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
make sure evalGeoGebraCAS() works from JavaScript

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24528 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e