feedTree: amend previous to check that nodes are actually there (2)

js/FeedTree.js

@@ -273,6 +273,7 @@ define(["dojo/_base/declare", "dojo/dom-construct", "dijit/Tree", "dijit/Menu"],
 				setTimeout(() => {
 					$("headlines-frame").focus();
 
+					if (treeNode) {
 						const node = treeNode.rowNode;
 						const tree = this.domNode;
 
@@ -282,6 +283,7 @@ define(["dojo/_base/declare", "dojo/dom-construct", "dijit/Tree", "dijit/Menu"],
 								$("feedTree").scrollTop = node.offsetTop;
 							}
 						}
+					}
 
 				}, 0);
 			}