Fix YouTube videos with no views

[wb9688]

• I carefully read the contribution guidelines and agree to them.
• I did test the API against NewPipe.
• I agree to ASAP create a PULL request for NewPipe for making in compatible when I changed the api.

Fixes TeamNewPipe/NewPipe#3238

[Stypox]

@wb9688 what happens in other localizations? I would put a check on the result of Utils.removeNonDigitCharacters(views): if it is an empty string I think it would be safe to return 0, as "No views" and hopefully all of its translations do not contain digits.

[wb9688]

@Stypox: There are multiple places where we use localized strings, e.g. https://github.com/wb9688/NewPipeExtractor/blob/cb57123be199dd1633776e65020fae487692a1f5/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamInfoItemExtractor.java#L243. @B0pol said he gave up on supporting localized YouTube sites though.

[Stypox]

I know localized YouTube is not correctly supported, but since there is the opportunity not to introduce another dependency on English, let's not do it ;-)

[gzsombor]

I've run into the same issue - independently - and fixed this way: #294

[wb9688]

Updated PR to use same approach as in YoutubeStreamInfoItemExtractor.

[TobiGr]

In general, I agree with @Stypox. However, as we only support content country "en" at the moment, this seems to be okay for now.

[Stypox]

@TobiGr oh, I was about to do it, I already added the change to the changelog ;-)

[TobiGr]

I added it, too. Maybe I have overridden it 😆