标段列表，显示层级相关

app/public/js/tender_showhide.js

@@ -156,7 +156,7 @@ function doTrStatus(node, status, all = '') {
 
 let tenderTreeShowLevel;
 const getChildrenLevel = function (node) {
-    let iLevel = node.level;
+    let iLevel = node.level || 1;
     if (node.children && node.children.length > 0) {
         for (const c of node.children) {
             iLevel = Math.max(iLevel, getChildrenLevel(c));