fix(测试计划):测试计划关联功能用例未勾选数据点击保存报错

--bug=1010619 --user=李敏 【测试跟踪】github#10985 测试计划关联功能用例 不勾选 用例 直接点确定会报错 https://www.tapd.cn/55049933/s/1109962

frontend/src/business/components/track/plan/view/comonents/functional/TestPlanFunctionalRelevance.vue

@@ -51,15 +51,20 @@ export default {
       }
     },
     saveCaseRelevance(param, vueObj) {
+      if (param.ids.length > 0) {
         param.planId = this.planId;
         vueObj.result = this.$post('/test/plan/relevance', param, () => {
           vueObj.isSaving = false;
           this.$success(this.$t('commons.save_success'));
           vueObj.$refs.baseRelevance.close();
           this.$emit('refresh');
-      },(error) => {
+        }, (error) => {
           vueObj.isSaving = false;
         });
+      } else {
+        vueObj.isSaving = false;
+        this.$warning(this.$t('test_track.plan_view.please_choose_test_case'));
+      }
     },
     search() {
       this.getTestCases();

frontend/src/i18n/en-US.js

@@ -2305,6 +2305,7 @@ export default {
       allow_associated_repetitive_cases_tip: "Whether to allow the same use case to be associated multiple times in the same test plan",
       performance_case_count: "Performance Case Count",
       running: "Running",
+      please_choose_test_case: "please select a test case！",
     },
     issue: {
       issue: "Issue",

frontend/src/i18n/zh-CN.js

@@ -2310,6 +2310,7 @@ export default {
       allow_associated_repetitive_cases_tip: "是否允许同一个测试计划中多次关联相同用例",
       performance_case_count: "性能测试用例数",
       running: "运行中",
+      please_choose_test_case: "请选择测试用例！",
     },
     issue: {
       issue: "缺陷",

frontend/src/i18n/zh-TW.js

@@ -2309,6 +2309,7 @@ export default {
       allow_associated_repetitive_cases_tip: "是否允許同一個測試計劃中多次關聯相同用例",
       performance_case_count: "性能測試用例數",
       running: "運行中",
+      please_choose_test_case: "请选择测试用例！",
     },
     issue: {
       issue: "缺陷",