Crash when YouTube video ID doesn't exist: `YouTubeDataAPIError: getting the video title failed`

Sentry Issue: [LMS-VIA-59](https://hypothesis.sentry.io/issues/4328968239/?referrer=github_integration)

```
IndexError: list index out of range
File "via/services/youtube.py", line 66, in get_video_title
return self._http_service.get(

YouTubeDataAPIError: getting the video title failed
(7 additional frame(s) were not displayed)
...
File "via/views/view_video.py", line 25, in youtube
video_title = youtube_service.get_video_title(video_id)
File "via/services/youtube.py", line 76, in get_video_title
raise YouTubeDataAPIError("getting the video title failed") from exc
```

Start with via/services/youtube.py around get_video_title and trace its use from via/views/view_video.py. Reproduce the behavior for a nonexistent YouTube video ID and determine the expected handling for that case. Done means the view no longer crashes with an IndexError when the ID does not exist.

Written by the indexing model from the issue text.