fix(接口场景): 创建场景时保存失败

修复通过模块树上方的更多操作中创建场景时，关联接口用例之后保存报错的问题

backend/src/main/java/io/metersphere/api/exec/utils/GenerateHashTreeUtil.java

@@ -35,7 +35,9 @@ public class GenerateHashTreeUtil {
     public static MsScenario parseScenarioDefinition(String scenarioDefinition) {
         if (StringUtils.isNotEmpty(scenarioDefinition)) {
             MsScenario scenario = JSONObject.parseObject(scenarioDefinition, MsScenario.class);
+            if (scenario != null) {
                 parse(scenarioDefinition, scenario);
+            }
             return scenario;
         }
         return null;

frontend/src/business/components/xpack

@@ -1 +1 @@
-Subproject commit f4ffae2eecd6c0aae3197e54503e0be21241d2e6
+Subproject commit fa028c4791370e1ea66eaa60dfa22eb0b0d70ea3