online在线表单加载字典错误导致页面崩溃

##### 版本号：2.4.6

##### 问题描述：在线表单设置的字段的字典值为空字符串时，例如dictCode= ""，页面会报加载错误的字典，之后再点新增按钮没有任何反应，直到导致页面崩溃。

##### 截图&代码：
链接：/online/cgform/api/getFormItem/{code}
表单的配置properties json片段：
"properties": {
        "amount": {
          "dbPointLength": 2,
          "view": "number",
          "fieldExtendJson": "",
          "type": "number",
          "title": "金额",
          "order": 11,
          "defVal": "0"
        },
        "type": {
          "dbPointLength": 0,
          "view": "radio",
          "dictCode": "",
          "dictTable": "",
          "fieldExtendJson": "",
          "type": "number",
          "title": "类型",
          "dictText": "",
          "order": 9,
          "defVal": "0"
        },
        "category": {
          "dbPointLength": 0,
          "view": "list",
          "dictCode": "",
          "dictTable": "",
          "fieldExtendJson": "",
          "type": "number",
          "title": "类别",
          "dictText": "",
          "order": 10,
          "defVal": "0"
        },
        "user_id": {
          "dbPointLength": 0,
          "view": "sel_search",
          "dictCode": "",
          "dictTable": "",
          "fieldExtendJson": "",
          "type": "string",
          "title": "商户用户",
          "dictText": "",
          "order": 8
        }
      },

没有判断dictCode的值为空，这样4个字段里，最终变成了3个请求，只要有dictCode字段就会去请求获取字典，链接就变成这样："/sys/dict/loadDict/undefined?_t=1631182850&pageSize=10&keyword=",返回的错误提示，最终导致页面js报错，再点新增按钮，页面崩溃

##### 解决思路：修改hibernate-re相关代码,或前端OnlineForm.umd.min.js。
1.前端对dictCode进行判空判断。
2.后台组装properties的字段的"dictCode"和"dictTable"时，进行判空，如果为空，不把此两列加进去。

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