[geeklog-hg] [Geeklog-Core/geeklog] 9516a3: Only set default theme if actual theme is not vali...

[Tom]

  Branch: refs/heads/master
  Home:   https://github.com/Geeklog-Core/geeklog
  Commit: 9516a3b8fc94083c188129d97fb8739f9ad6d1aa
      https://github.com/Geeklog-Core/geeklog/commit/9516a3b8fc94083c188129d97fb8739f9ad6d1aa
  Author: Tom <eSilverStrike at users.noreply.github.com>
  Date:   2022-07-23 (Sat, 23 Jul 2022)

  Changed paths:
    M public_html/admin/install/classes/Migrate.php
    M public_html/admin/install/classes/Upgrade.php

  Log Message:
  -----------
  Only set default theme if actual theme is not valid and default theme exists on an upgrade or migrate

For #992