fix(测试跟踪): 脑图按层级展开后保存，会创建root节点

--bug=1022243 --user=陈建星 【测试跟踪】脑图模式-展开到用例层级-快捷键复制模块A到模块B下-保存失败 https://www.tapd.cn/55049933/s/1344360

test-track/frontend/src/business/common/minder/TestCaseMinder.vue

@@ -361,7 +361,7 @@ export default {
 
         if (data.type !== 'tmp' && data.changed) {
           if (isModuleNodeData(data)) {
-            if (data.contextChanged) {
+            if (data.contextChanged && data.id !== 'root') {
               this.buildSaveModules(root, data, parent);
               root.children && root.children.forEach(i => {
                 if (isModuleNode(i)) {

test-track/frontend/src/i18n/lang/en-US.js

@@ -19,7 +19,6 @@ const message = {
       case_type: "Case Type",
       test_plan: "Test Plan",
       failure_times: "Failure times",
-      minder_paste_tip: "The pasted node has modules with unloaded use cases, copying unloaded use cases is not currently supported!"
     },
     rate: {
       case_review: "Review rate",
@@ -151,6 +150,7 @@ const message = {
     cancel_relate_case_tips_content: "Cancel it will affect the test plan statistics. Sure?",
     back_tips: "TestCase is not saved, Are you sure to quit?",
     dependency_remove_confirm: "Is dependency release confirmed?",
+    minder_paste_tip: "The pasted node has modules with unloaded use cases, copying unloaded use cases is not currently supported!",
     public: {
       remove: 'Whether to remove the use case ',
       batch_remove_confirm: "Confirm remove {0} item use case?",

test-track/frontend/src/i18n/lang/zh-CN.js

@@ -19,7 +19,6 @@ const message = {
       case_type: "用例类型",
       test_plan: "所属测试计划",
       failure_times: "失败次数",
-      minder_paste_tip: "粘贴的节点中有未加载用例的模块，目前不支持复制未加载的用例！"
     },
     rate: {
       case_review: "评审率",
@@ -151,6 +150,7 @@ const message = {
     cancel_relate_case_tips_content: "取消关联会影响测试计划相关统计, 确定取消吗?",
     back_tips: "你填写的信息未保存, 确定退出吗?",
     dependency_remove_confirm: "确定解除依赖吗?",
+    minder_paste_tip: "粘贴的节点中有未加载用例的模块，目前不支持复制未加载的用例！",
     public: {
       remove: '是否移除用例',
       batch_remove_confirm: "确定移除{0}项用例?",

test-track/frontend/src/i18n/lang/zh-TW.js

@@ -19,7 +19,6 @@ const message = {
       case_type: "用例類型",
       test_plan: "所屬測試計劃",
       failure_times: "失敗次數",
-      minder_paste_tip: "粘貼的節點中有未加載用例的模塊，目前不支持復製未加載的用例！"
     },
     rate: {
       case_review: "評審率",
@@ -151,6 +150,7 @@ const message = {
     cancel_relate_case_tips_content: "取消關聯會影響測試計劃相關統計, 確定取消嗎?",
     back_tips: "你填寫的信息未保存, 確定退出嗎?",
     dependency_remove_confirm: "確定解除依賴嗎?",
+    minder_paste_tip: "粘貼的節點中有未加載用例的模塊，目前不支持復製未加載的用例！",
     public: {
       remove: '是否移除用例',
       batch_remove_confirm: "確定移除{0}項用例?",