Not to add the episode to the feed if it wasn't downloaded

[Rpsl]

When youtube-dl failed while episode downloading this episode is still being added to the feed.

INFO[2020-01-11T08:57:26Z] -> updating https://www.youtube.com/channel/UCUllb83Lugbka-rvF6Nutxg  feed_id=kreosan format=video quality=high
INFO[2020-01-11T08:57:27Z] ! downloading episode https://youtube.com/watch?v=keByJcbiICk  episode_id=keByJcbiICk index=0
ERRO[2020-01-11T09:00:07Z] youtube-dl error: [youtube] keByJcbiICk: Downloading webpage
[youtube] keByJcbiICk: Downloading video info webpage
[download] Destination: /app/data/kreosan/keByJcbiICk.f299.mp4
[download]   0.0% of 1.26GiB at Unknown speed ETA Unknown ETA
.... //
[ERROR: unable to download video data: <urlopen error [Errno 99] Address not available>  episode_id=keByJcbiICk error="failed to execute youtube-dl: exit status 1" index=0
ERRO[2020-01-11T09:00:07Z] failed to get episode file size               episode_id=keByJcbiICk error="stat /app/data/kreosan/keByJcbiICk.mp4: no such file or directory" index=0

Possibly this will be fixed after implementation storage.
I'll leave issue at that, so as not to forget.

[mxpv]

This should be fixed in master

podsync/cmd/podsync/updater.go

Line 266 in 0ef90e1

if episode.Status != model.EpisodeDownloaded {