script variable has "processDefinitionId" is error #2664 (#2666)

Co-authored-by: qiaozhanwei <qiaozhanwei@analysys.com.cn>

dolphinscheduler-service/src/main/java/org/apache/dolphinscheduler/service/process/ProcessService.java

@@ -337,11 +337,13 @@ public class ProcessService {
 
             for (TaskNode taskNode : taskNodeList){
                 String parameter = taskNode.getParams();
-                if (parameter.contains(CMDPARAM_SUB_PROCESS_DEFINE_ID)){
+                JSONObject parameterJson = JSONObject.parseObject(parameter);
+                if (parameterJson.getInteger(CMDPARAM_SUB_PROCESS_DEFINE_ID) != null){
                     SubProcessParameters subProcessParam = JSON.parseObject(parameter, SubProcessParameters.class);
                     ids.add(subProcessParam.getProcessDefinitionId());
                     recurseFindSubProcessId(subProcessParam.getProcessDefinitionId(),ids);
                 }
+
             }
         }
     }