没有模块时，提示先创建模块

frontend/src/business/components/track/case/TestCase.vue

@@ -160,6 +160,10 @@
       },
       editTestCase(testCase) {
         this.testCaseReadOnly = false;
+        if (this.treeNodes.length < 1) {
+          this.$warning('请先新建模块');
+          return;
+        }
         this.$refs.testCaseEditDialog.open(testCase);
       },
       copyTestCase(testCase) {

frontend/src/i18n/en-US.js

@@ -391,6 +391,7 @@ export default {
       delete: "Delete case",
       save_create_continue: "Save and create continue",
       please_create_project: "No project available, please create the project first",
+      create_module_first: "Please create module first",
       import: {
         import: "Import test case",
         case_import: "Import test case",

frontend/src/i18n/zh-CN.js

@@ -388,6 +388,7 @@ export default {
       delete: "删除用例",
       save_create_continue: "保存并继续创建",
       please_create_project: "暂无项目，请先创建项目",
+      create_module_first: "请先新建模块",
       import: {
         import: "导入用例",
         case_import: "导入测试用例",

frontend/src/i18n/zh-TW.js

@@ -390,6 +390,7 @@ export default {
       delete: "删除用例",
       save_create_continue: "保存並繼續創建",
       please_create_project: "暫無項目，請先創建項目",
+      create_module_first: "請先新建模塊",
       import: {
         import: "導入用例",
         case_import: "導入測試用例",