private static void FixDocument(WordprocessingDocument document)
 {
     foreach (var root in document.RecursivePartsRootElements())
     {
         foreach (var cell in root.Descendants<TableCell>().ToList())
         {
             if (!cell.ChildElements.Any(c => !(c is TableCellProperties)))
                 cell.AppendChild(new Paragraph());
         }
     }
 }