add: var value = cellInfo.value; 
context: qx.Proto._formatValue = function(cellInfo) {  if (value == null) {    return "";  } else if (typeof value == qx.constant.Type.NUMBER) {    return qx.ui.table.DefaultDataCellRenderer._numberFormat.format(value);  } else if (value instanceof Date) {    return qx.util.format.DateFormat.getDateInstance().format(value);  } else {    return value;  }}
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/73efe6a92cc05cf6c8b9abce364f2e75c3f3c2f6/DefaultDataCellRenderer.js/buggy/qooxdoo/frontend/framework/source/class/qx/ui/table/DefaultDataCellRenderer.js