fix(测试计划): 执行用例已被取消点击报错

--bug=1045364 --user=王旭 【测试计划】执行功能用例-用例已被取消-点击报错 https://www.tapd.cn/55049933/s/1565276

backend/services/test-plan/src/main/java/io/metersphere/plan/service/TestPlanFunctionalCaseService.java

@@ -723,6 +723,9 @@ public class TestPlanFunctionalCaseService extends TestPlanResourceService {
 
     public TestPlanCaseDetailResponse getFunctionalCaseDetail(String id, String userId) {
         TestPlanFunctionalCase planFunctionalCase = testPlanFunctionalCaseMapper.selectByPrimaryKey(id);
+        if(planFunctionalCase == null){
+            throw new MSException(Translator.get("resource_not_exist"));
+        }
         String caseId = planFunctionalCase.getFunctionalCaseId();
         FunctionalCaseDetailDTO functionalCaseDetail = functionalCaseService.getFunctionalCaseDetail(caseId, userId, false);
         String caseDetailSteps = functionalCaseDetail.getSteps();

frontend/src/views/test-plan/testPlan/detail/featureCase/detail/index.vue

@@ -433,6 +433,7 @@
     } catch (error) {
       // eslint-disable-next-line no-console
       console.log(error);
+      loadCaseList();
     } finally {
       caseDetailLoading.value = false;
     }