优化

app/src/main/java/io/legado/app/ui/book/group/GroupEditDialog.kt

@@ -58,7 +58,7 @@ class GroupEditDialog() : BaseDialogFragment(R.layout.dialog_book_group_edit) {
         @Suppress("DEPRECATION")
         bookGroup = arguments?.getParcelable("group")
         bookGroup?.let {
-            binding.btnDelete.visible()
+            binding.btnDelete.visible(it.groupId > 0 || it.groupId == Long.MIN_VALUE)
             binding.tieGroupName.setText(it.groupName)
             binding.ivCover.load(it.cover)
         } ?: let {

app/src/main/java/io/legado/app/ui/config/BackupConfigFragment.kt

@@ -330,6 +330,7 @@ class BackupConfigFragment : PreferenceFragment(),
             restoreJob = coroutineContext[Job]
             AppWebDav.showRestoreDialog(requireContext())
         }.onError {
+            AppLog.put("恢复备份出错WebDavError\n${it.localizedMessage}", it)
             alert {
                 setTitle(R.string.restore)
                 setMessage("WebDavError\n${it.localizedMessage}\n将从本地备份恢复。")