Debugging

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23262 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Init CAS view with 0 rows

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23263 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix for Web's CAS cells

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23264 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e