[YouTube] Trending is empty sometimes

[FireMasterK]

On YouTube, NewPipeExtractor returns an empty array of relatedItems.

This affects both Piped and even NewPipe.

[AudricV]

YouTube is A/B testing a new format data. When updating mocks of a PR, I got the chance to get this new format data!

The access to the trending data tab content is still the same:

contents -> twoColumnBrowseResultsRenderer -> tabs -> tabRenderer -> 0 -> content

The old model is:

sectionListRenderer -> contents -> itemSectionRenderer -> contents -> 0 -> shelfRenderer -> content -> expandedShelfContentsRenderer -> items

The new one is:

richGridRenderer -> contents -> richItemRenderer -> content

Inside each model, we have videoRenderers, which can be already extracted as StreamInfoItems with YoutubeStreamInfoItemExtractor objects.

Note: this new model contains richSectionRenderers, which are for trending shorts and for the recently trending section, which contains in it some of the normal trends.

This new model has so the benefits to only extract the real trending data (limited to the 50 first videos, contrary to the official API which can get up to 200 videos, but that's the same result on YouTube specific trendings (Music, Gaming, Movies)).

[AudricV]

Here is the new UI for reference (sorry for the light theme, I prevented YouTube to store cookies in order to be able to get the new UI easier):