关联审批单 和 附件 参数为非必填项

我利用API提交审批流程，不上传关联审批单 和 附件，报错301025

调用接口	提交审批申请
请求地址	https://qyapi.weixin.qq.com/cgi-bin/oa/applyevent
返回状态	
status: HTTP/1.1 200 OK
connection: close
error-code: 301025
error-msg: get approval param error:
content-type: application/json; charset=UTF-8
content-length: 55
返回结果	{ "errcode": 301025, "errmsg": "get approval param error:" }

{
  "creator_userid": "aaaaa",
  "template_id": "Bs7zzfFJS5xZHf7G5ETnxxxxxx2FvRQz7ZvfVQJLi",
  "use_template_approver": 1,
  "apply_data": {
    "contents": [
      {
        "control": "RelatedApproval",
        "id": "RelatedApproval-1605611143898",
        "title": [{
          "text": "关联审批单",
          "lang": "zh_CN"
        }],
        "value": {
          "related_approval": {
            "sp_no": ""
          }
        }
      },
      {
        "control": "File",
        "id": "File-1605691319461",
        "title": [{
          "text": "附件",
          "lang": "zh_CN"
        }],
        "value": {
          "files": [{
            "file_id": ""
          }]
        }
      },
      {
        "control": "Textarea",
        "id": "Textarea-1605691324779",
        "title": [{
          "text": "备注",
          "lang": "zh_CN"
        }],
        "value": {
          "textarea": "测试"
        }
      }
    ]
  },
  "summary_list": [{
    "summary_info": [{
      "text": "摘要第1行",
      "lang": "zh_CN"
    }]
  }]
}