Fallback to random track if getsimilar returns empty

[spicyPoke]

Hi, I found that for some tracks that lack similarities with other tracks, Tempus will not add any track into the current queue when continuous play is active.
My proposal was to fallback to random tracks so it will continue playing regardless.

This PR make getContinuousMix use getSimilarSongs2 as the main functionality and fallback to getSimilarSongs if that fail. After that the result of it is filtered against the current queue, if it returns empty then we fallback to random 25 songs.

[MaFo-28]

One problem with continuous play is excessive filling of queue, especially with a small library.
That's why I suggested #721 which deletes part of queue before doing the getSimilarSongs.

These two approaches are not incompatible.

[spicyPoke]

Hi @MaFo-28, yes, I agree.

I actually check #721 first to see if yours tackle the same issue. Since, this PR solves different part of the problem, I figured this can coexist with yours.

[MaFo-28]

Actually, I'm not a big fan of sending random tracks instead of similar songs.
Results will be very strange.

Perhaps we could add a "Random Fallback" preference, just below Continuous play option?

[eddyizm]

We need to think about this as @MaFo-28 said, it is very jarring to have it do something unexpected.

I actually tried this in the not so distance past when I refactored a bunch of the play stuff and let me tell you, it was a disaster. Of course, most of it was due to my flawed implementation but even if it had worked as expected, it would still be sketch. I like the preference - I think with the other PR, we could make this a section. The discovery section kinda works this way already as a random feature.

[spicyPoke]

Thank you for the feedbacks, I'll update the PR to include a preference in the option menu.

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[spicyPoke]

Hi, I've updated the PR with preference switch.

[eddyizm]

Hi @spicyPoke
We made quite a bit of changes since this one was submitted. Thank you for adding the preference, that really upset folks when i first gave that as an option myself.
If you can resolve these conflicts, I will work on getting this into a dev soon.