hide spreadsheet style bar in applets if the row/column headers are missing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27295 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
hide spreadsheet style bar in applets if the row/column headers are missing

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27296 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e