fix - 调整设置审批人的校验

workflow-engine-core/src/main/java/cn/axzo/workflow/core/engine/cmd/CustomBizSpecifyAssigneeToTaskCmd.java

@@ -89,12 +89,13 @@ public class CustomBizSpecifyAssigneeToTaskCmd extends AbstractCommand<Boolean>
      * @param assigners
      */
     public static void validate(RuntimeService runtimeService, String executionId, Task task, List<BpmnTaskDelegateAssigner> assigners) {
+        validTask(task, executionId);
+
         BpmnModel bpmnModel = ProcessDefinitionUtil.getBpmnModel(task.getProcessDefinitionId());
         boolean present = assigners.stream().anyMatch(assigner -> !StringUtils.hasText(assigner.getNodeId()));
         if (present && getCategoryVersion(bpmnModel.getMainProcess()).orElse(0) > 0) {
             throw new WorkflowEngineException(ASSIGNEE_NODE_ID_NOT_EXISTS, "审批人");
         }
-        validTask(task, executionId);
         //校验审批人数量是否超过限制
         validTaskAssignerCount(runtimeService, (TaskEntity) task, assigners);
     }