Remove rescue which unexpectedly skips a failed block
Remove rescue which unexpectedly skips a failed block

Project::VideoHandler#download_video_thumbnail is called just from
workers, not directly affecting the user. If, for some reason the
thumbnail download fail, it used to happen silently. Without it, will
throw an exception and queued to retry list.

gustavoguichard/neighborly,gustavoguichard/neighborly,gustavoguichard/neighborly