fix(测试跟踪): 脑图保存丢失临时节点

--bug=1013090 --user=陈建星 【测试跟踪】github#13428脑图 模块下 直接添加数据，不添加标签，切换全部用例模块，添加的数据没有直接展示 https://www.tapd.cn/55049933/s/1155900

frontend/src/business/components/common/components/MsModuleMinder.vue

@@ -142,11 +142,10 @@ export default {
       if (!children) {
         children = [];
       }
-      let caseNum = root.data.caseNum;
       if (root.data.text === '未规划用例' && root.data.level === 1) {
         root.data.disable = true;
       }
-      if (children.length < 1 && (this.ignoreNum || caseNum && caseNum > 0)) {
+      if (children.length < 1) {
         root.children.push({
           data: {
             text: '',

frontend/src/business/components/track/common/minder/TestCaseMinder.vue

@@ -323,7 +323,7 @@ name: "TestCaseMinder",
           nodes = [];
         }
         nodes.push(JSON.stringify(this._buildExtraNode(root)));
-        this.saveExtraNode[parent.id] = nodes;
+        this.saveExtraNode[parent.newId ? parent.newId : parent.id] = nodes;
       }
     },
     buildSaveCase(node, parent, preNode, nextNode) {