Please note that when wagering on total goals odd/even, you are wagering on whether the total number of goals in the game will be an odd number (1, 3, 5, 7, etc) or an even number (0, 2, 4, etc).
For wagering purposes a game with no goals is "even".
Therefore if you place a wager on even and the game ends with no goals, 0-0, your wager will be graded as a winner.