fix(cache): harden ohli24 cached list parsing

- reject cached list/search html when rows lack parseable link and title
- skip malformed rows instead of failing whole list parsing
- record the cache parsing fix in the dated history log
- bump anime_downloader plugin version to 0.7.20

Co-Authored-By: First Fluke <our.first.fluke@gmail.com>

info.yaml

@@ -1,5 +1,5 @@
 title: "애니 다운로더"
-version: 0.7.19
+version: 0.7.20
 package_name: "anime_downloader"
 developer: "projectdx"
 description: "anime downloader"