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* Added new Regex for prosiebensat1 Extractor Description. Fixes #11810

* Using _og_search_description() as a Fallback for Description-Regex

* Using _og_search_description() as a Fallback for Description-Regex - Second try

* Also added fallback regex

* Using _og_search_description() as a Fallback for Description-Regex - Third try

* removed fatal=False from search for description regex. default=None should be preferred only

* Using fatal=false for _og_search_description

* Revert "Using fatal=false for _og_search_description"

This reverts commit 2b7e123f9d0f2bd6ada54fa8e4e6035fece5dbf4.

* Deleted default=None Parameter for _og_search_property

See https://github.com/rg3/youtube-dl/pull/9028, especially @lachs0r's
comments for the reason behind this change

[NRKTV] Added season and episode number to metadata.

[NRKTV] Added category to metadata.

[NRKTV] Added tests to NRKTVSeries.

[NRKTV] Fixed whitespace issues (flake8).

Closes #11890
Closes #11891
Closes #11892
Closes #11894
Closes #11895
Closes #11897
Closes #11900
Closes #11903
Closes #11904
Closes #11906
Closes #11907
Closes #11909
Closes #11913
Closes #11914
Closes #11915
Closes #11916
Closes #11917
Closes #11918
Closes #11919

NPO websites changed the domain they used for subtitles, from
e.omroep.nl to tt888.omroep.nl.

added --autonumber-start NUMBER as a command line option to be able to offset the index at which autonumber formats filenames