Show a note about empty final input in movies whose input we can parse

[vadosnaprimer]

Judges need to do this manually, and they may forget. Also regular users would be able to know it and post a trimmed movie for replacement.

[Masterjun3]

If someone implements this, this would need at least 3 states: Blank input, No blank input, and Unknown. (Unknown is important for the parsers where we couldn't detect it or it isn't implemented yet.)