add: if (value) treeCell.setAttribute("display",value); 
context: function addTreeItemToTreeChild(treeChild, label){  var treeElem1 = document.createElement("treeitem");  treeElem1.setAttribute("container","true");  treeElem1.setAttribute("open","true");  treeElem1.setAttribute("class","treecell-indent");  var treeRow = document.createElement("treerow");  var treeCell = document.createElement("treecell");  treeCell.setAttribute("class", "treecell-indent");  treeCell.setAttribute("label",label);  treeRow.appendChild(treeCell);  treeElem1.appendChild(treeRow);  treeChild.appendChild(treeElem1);  return treeElem1;}
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