Division by zero if ply_count = 0

[NajdorfB]

I experienced the case that ply_count can be zero, resulting in two separate division by zero errors. My quick fix was just to ensure that division by zero is not possible (see 9a311a0 )

Other solutions might be better or preferred.

[rpdelaney]

Thank you. I handled a similar problem like this: 6caa559

I tend to find that clearer since it's more obviously there for error state handling. What do you think?

[NajdorfB]

Thank you. I handled a similar problem like this: 6caa559

I tend to find that clearer since it's more obviously there for error state handling. What do you think?

Yeah, it seems like a nice solution, definitive clearer.

[rpdelaney]

Cool. I will get around to it. Feel free to send a PR in the mean time.

By the way, did you observe this with zero-length PGN games or was it with 'normal' games?

[NajdorfB]

I think it happened with zero-length PGN games, but I'm not sure.