fix: 关联表单必填逻辑问题

package.json

 {
   "name": "panda-xform",
-  "version": "5.9.3",
-  "description": "5.9.3 增加压缩文件配置默认为压缩",
+  "version": "5.9.4",
+  "description": "5.9.4 关联表单必填逻辑问题",
   "keywords": [
     "panda-xform"
   ],

src/core/widgets/advanced/RelationForm/index.js

@@ -170,7 +170,9 @@ const RelationForm = (props) => {
       let tableData = data?.jsonData ? JSON.parse(data?.jsonData) : []
       if (Array.isArray(tableData)) {
         setDataSource(tableData)
-        onChange(`${tableData.length}`)
+        if (tableData.length) {
+          onChange(`${tableData.length}`)
+        }
         let relationForm = addons.getValue('relationForm') || { configs: [], data: [], table: [] }
         window.tableLocal.push({ config, dataSource: tableData, schema })
         addons.setValue('relationForm', {
@@ -180,7 +182,7 @@ const RelationForm = (props) => {
         })
       } else {
         setDataSource([])
-        onChange(`${0}`)
+        onChange('')
       }
     } else {
       message.error(msg)