title: AutosizeColumns on SXSSFWorkbook
body: <p>Is it possible to autoSizeColumns on a streaming SXSSFWorkbook?
  I implemented an export functionality to export a list of objects to excel. At first I used the XSSFWorkbook (not streaming) and after all the cells were created, I autosized all the columns, resulting in a nice excel file.</p>
  
  <p>For performance issues we wanted to change the workbook to the streaming version, but this resulted in a NullPointer at org.apache.poi.ss.util.SheetUtil.getCellWidth.</p>
  
  <p>Is it possible to call autoSizeColumns for a SXSSFWorkbook?</p>
  
  <p>Im using poi-ooxml 3.9, but I have the same issue in 3.8.</p>