fix(generator): when the theme is not set, the property configuration will not be displayed

[mengshang918]

Motivation

修复以下schema，不展示属性配置的bug

{
  "type": "object",
  "validateTime": "change",
  "ui": {},
  "theme": "antd",
  "schema": [
    {
      "type": "string",
      "title": "输入框",
      "ui": {
        "type": "text",
        "style": {
          "width": "100%"
        }
      },
      "fieldKey": "text_vTNSKq"
    }
  ]
}

Have you read the Contributing Guidelines on pull requests?

Y

Test Plan

Related PRs

N