code: public String getInvalidDataValue() {
          final JavascriptVarBuilder vb = new JavascriptVarBuilder(null, true);
          for (final SheetInvalidUpdate sheetInvalidUpdate : getInvalidUpdates()) {
              final Object rowKey = sheetInvalidUpdate.getInvalidRowKey();
              final int col = getRenderIndexFromRealIdx(sheetInvalidUpdate.getInvalidColIndex());
              final String rowKeyProperty = this.getRowKeyValueAsString(rowKey);
              vb.appendProperty(rowKeyProperty + "_c" + col,
                          sheetInvalidUpdate.getInvalidMessage().replace("'", "&apos;"), true);
          }
          return vb.closeVar().toString();
      }
docs: Generates the bad data var value for this sheet.
  
  @return