fix:人脸模型为空导致注册识别引擎出错的问题

lib/common/utils/sync/sync_face_tool.dart

@@ -9,6 +9,20 @@ import 'package:pj_supermarket_cloud/common/index.dart';
 class SyncFaceTool {
   static const _tag = "sync人脸工具";
 
+  // 删除数据库中为空的人脸
+  static Future<void> delEmptyFace() async {
+    final app = Get.find<AppControl>();
+    final faceDao = app.dataBase.getFaceDao;
+    final faceList = await faceDao.getEmptyFaceList();
+    if (ObjectUtil.isEmptyList(faceList)) return;
+    for (final v in faceList!) {
+      if (ObjectUtil.isNotEmpty(v.path)) {
+        await delFaceByStorage(filePath: v.path!);
+      }
+      await faceDao.delById(v.id!);
+    }
+  }
+
   // 同步人脸
   static Future<void> syncFace({
     bool isAll = false,