title: ClosedXML - charts missing after saving
body: <p>I'm using <code>ClosedXML</code> to change the values of some cells in a XLSX file. These cells are used to generate a chart on another sheet.</p>
  
  <p>I'm not touching the chart at all with ClosedXML. In fact, I'm not even touching the sheet that contains it, I'm just changing the values of some data cells, like this:</p>
  
  <pre><code>var workbook = new XLWorkbook(@"C:\path\to\my\file.xlsx");
  var dataWorksheet = workbook.Worksheet("data");
  var cell = dataWorksheet.Cell(1, 2);
  cell.Value = 30;
  workbook.Save();
  </code></pre>
  
  <p>However, when I re-open the file in Excel, the chart that was on the other sheet (which I haven't touched at all) simply disappears, leaving the sheet empty.</p>
  
  <p>I know ClosedXML doesn't support the CREATION of charts, but is there a way to avoid LOSING them when saving?</p>