avoid reporting error when it is a user request error

weed/filer/filer_delete_entry.go

@@ -80,7 +80,7 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 			}
 			if lastFileName == "" && !isRecursive && len(entries) > 0 {
 				// only for first iteration in the loop
-				glog.Errorf("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
+				glog.V(0).Infof("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
 				return nil, nil, fmt.Errorf("%s: %s", MsgFailDelNonEmptyFolder, entry.FullPath)
 			}