Fetching subscriptions aborts with "network error" if a PeerTube instance is down

[UniqueActive]

Hello,

Description

I am subscribed to channels from several PeerTube instances in addition to YouTube channels. One of the PeerTube instances, "video.blender.org", currently has an expired certificate. When updating the "What's new" subscriptions feed, NewPipe fetches the first half of my subscriptions until it encounters the video.blender.org channel, at which point it aborts with "Network error" and does not fetch the rest of the subscriptions. It should also be noted that this does not only happen when a certificate is expired, but also when the server is unreachable for any other reason. I have previously experienced this issue with another instance that regularly went down, and I simply had to unsubscribe from all channels of that instance to be able to use NewPipe 😅

Steps to reproduce

1. Be subscribed to several YouTube and PeerTube channels
2. One of the PeerTube channels goes offline or the certificate expires (hard to reproduce manually)
3. Refresh your subscriptions feed

Expected behaviour

NewPipe fetches subscriptions from every channel besides the ones that are offline.

Actual behaviour

NewPipe fetches subscriptions until it encounters one that is broken/offline, after which it abruptly stops, not fetching the rest of the subscriptions. The (correctly working) channels that come after the broken one are never fetched.

Suggested solution

When encountering an error while fetching a PeerTube channel's video, do not stop fetching subscriptions. Attempt to fetch all further subscriptions and at the end, simply indicate which channels were not fetched, and optionally the reason.

Thanks for your amazing work on NewPipe!

[ThisIsPaulDaily]

I can confirm this just started happening to me at about midnight Central Time 2020-12-30

I'm not sure I'm subscribed to peertubes, but I know one of the channels I subscribed to is deactivated or something.

I confirm that by unsubscribing to the one broken channel that I am able to refresh. I think it may have been peertube it was an old conference or something.