fix: 上传空文件禁止上传

package.json

 {
   "name": "panda-xform",
-  "version": "6.0.6",
-  "description": "6.0.6 因为特殊图片路径导致图片无法删除",
+  "version": "6.0.7",
+  "description": "6.0.7 上传空文件禁止上传",
   "keywords": [
     "panda-xform"
   ],

src/core/widgets/file/FileUpload/index.js

@@ -123,6 +123,9 @@ const FileUpload = (props) => {
       return _continueUpload;
     },
     onChange: ({ file, fileList, event }) => {
+      if (!file.size) {
+        return message.error('上传文件为空，禁止上传！')
+      }
       // 检验名字，名字不通过不允许显示
       if (filenameVerification(file).type === 'error') return false;
       // 返回的链接在file.response内；不设置url，预览图表不可点击