fix 访问最近的计划中已删除的测试计划报错

backend/src/main/java/io/metersphere/track/service/TestCaseNodeService.java

@@ -229,6 +229,9 @@ public class TestCaseNodeService {
 
     public List<TestCaseNodeDTO> getAllNodeByPlanId(String planId) {
         TestPlan testPlan = testPlanMapper.selectByPrimaryKey(planId);
+        if (testPlan == null) {
+            return Collections.emptyList();
+        }
         return getNodeTreeByProjectId(testPlan.getProjectId());
     }
 

backend/src/main/java/io/metersphere/track/service/TestCaseService.java

@@ -134,7 +134,9 @@ public class TestCaseService {
     public List<TestCase> getTestCaseNames(QueryTestCaseRequest request) {
         if ( StringUtils.isNotBlank(request.getPlanId()) ) {
             TestPlan testPlan = testPlanMapper.selectByPrimaryKey(request.getPlanId());
-            request.setProjectId(testPlan.getProjectId());
+            if (testPlan != null) {
+                request.setProjectId(testPlan.getProjectId());
+            }
         }
 
         List<TestCase> testCaseNames = extTestCaseMapper.getTestCaseNames(request);

backend/src/main/java/io/metersphere/track/service/TestPlanService.java

@@ -91,7 +91,7 @@ public class TestPlanService {
     }
 
     public TestPlan getTestPlan(String testPlanId) {
-        return testPlanMapper.selectByPrimaryKey(testPlanId);
+        return Optional.ofNullable(testPlanMapper.selectByPrimaryKey(testPlanId)).orElse(new TestPlan());
     }
 
     public int editTestPlan(TestPlan testPlan) {