fix for LocusEquation getting "stuck" as undefined (might fix #3795 too)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30949 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.234.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30950 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
temporary fix for [web] compile error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30951 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e