message: col width can be zero for a colspan dummy cell
diff: @@ -211,10 +211,11 @@ function slideObjectToXml(slide: PresSlide | SlideLayout): string {
  if (Array.isArray(objTabOpts.colW)) {
  strXml += '<a:tblGrid>'
  for (let col = 0; col < intColCnt; col++) {
  - strXml +=
  - '<a:gridCol w="' +
  - Math.round(inch2Emu(objTabOpts.colW[col]) || (typeof slideItemObj.options.w === 'number' ? slideItemObj.options.w : 1) / intColCnt) +
  - '"/>'
  + let w = inch2Emu(objTabOpts.colW[col])
  + if (w == null || isNaN(w)) {
  + w = (typeof slideItemObj.options.w === 'number' ? slideItemObj.options.w : 1) / intColCnt
  + }
  + strXml += '<a:gridCol w="' + Math.round(w) + '"/>'
  }
  strXml += '</a:tblGrid>'
  }
  