public async Task RemoveEmptyAsync(params string[] defUrls)
 {
     foreach (var defUrl in defUrls)
     {
         await _assetTableStorage.DeleteAsync(AssetDefinitionDefinitionEntity.CreateEmpty(defUrl));
     }
 }
 public async Task InsertEmptyAsync(string defUrl)
 {
     await _assetTableStorage.InsertOrReplaceAsync(AssetDefinitionDefinitionEntity.CreateEmpty(defUrl));
 }