picker设置了默认值时的bug

[BrentHuang]

amis 6.10.0

编辑设备按钮，点击弹出“编辑设备”对话框，对话框中放一个form表单，form表单中放一个picker（用于选择已有的设备组，source配置为接口，分页拉取设备组）

{
  "type": "page",
  "id": "u:35f5d256a94d",
  "asideResizor": false,
  "pullRefresh": {
    "disabled": true
  },
  "regions": [
    "body"
  ],
  "body": [
    {
      "type": "button",
      "label": "编辑",
      "onEvent": {
        "click": {
          "actions": [
            {
              "ignoreError": false,
              "actionType": "dialog",
              "dialog": {
                "type": "dialog",
                "title": "编辑设备",
                "body": [
                  {
                    "id": "u:a0b36d55d540",
                    "type": "form",
                    "title": "表单",
                    "mode": "flex",
                    "labelAlign": "left",
                    "dsType": "api",
                    "feat": "Edit",
                    "body": [
                      {
                        "type": "picker",
                        "label": "设备组",
                        "name": "group_id",
                        "overflowConfig": {
                          "maxTagCount": -1
                        },
                        "modalClassName": "app-popover :AMISCSSWrapper",
                        "id": "u:f831f83ee73b",
                        "multiple": false,
                        "value": "${\"abc\"}",
                        "source": {
                          "method": "post",
                          "url": "http://localhost:8000/api/v1/devices/group/list?page=${page}&size=${perPage}",
                          "requestAdaptor": "",
                          "adaptor": "",
                          "messages": {},
                          "dataType": "json"
                        },
                        "labelField": "name",
                        "valueField": "id"
                      }
                    ],
                    "api": {
                      "url": "http://localhost:8000//api/v1/devices/update/1",
                      "method": "get"
                    },
                    "actions": [
                      {
                        "type": "button",
                        "label": "提交",
                        "onEvent": {
                          "click": {
                            "actions": [
                              {
                                "actionType": "submit",
                                "componentId": "u:a0b36d55d540"
                              }
                            ]
                          }
                        },
                        "level": "primary"
                      }
                    ],
                    "resetAfterSubmit": true,
                    "initApi": ""
                  }
                ],
                "id": "u:7795f12070d5",
                "actions": [
                  {
                    "type": "button",
                    "actionType": "cancel",
                    "label": "取消",
                    "id": "u:5080f7523d0a"
                  },
                  {
                    "type": "button",
                    "actionType": "confirm",
                    "label": "确定",
                    "primary": true,
                    "id": "u:392fc5786caa"
                  }
                ],
                "showCloseButton": true,
                "closeOnOutside": false,
                "closeOnEsc": false,
                "showErrorMsg": true,
                "showLoading": true,
                "draggable": false,
                "actionType": "dialog"
              }
            }
          ]
        }
      },
      "id": "u:cdf66fba427e"
    }
  ],
  "definitions": {}
}

问题：当picker的value有值时，点击编辑按钮打开对话框时，会执行picker配置的source分页拉取接口，但是传给接口的page、perPage为空。当picker的value未设置时，点击编辑按钮打开对话框时，不会执行picker配置的source分页拉取接口。

期望：不管picker的value有没有值，点击编辑按钮打开对话框时，都不需要执行picker配置的source分页拉取接口。

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[BrentHuang]

@2betop 请看一下这个问题