Detect garbage data better

[fwenzel]

This is the game: http://www.j-archive.com/showgame.php?game_id=6153

I wrote code to detect empty clues and avoid those games, but if there's clear garbage data anywhere, we need to avoid it as well. Probably if hint < 5 characters will make it more robust.

[fwenzel]

(the = category has all questions and answers as =)