Fixing segfaults with elitism.
Fixing segfaults with elitism.

During elitism, some individuals are transfered to the next generation
and leaving behind a null value. Null values can obviously be free'd,
but the application segfaults as soon as one tried to read from a struct
of a null reference.

badeball/tetris-ea,badeball/tetris-ea,badeball/tetris-ea,badeball/tetris-ea