Missing move number on pgn with black to move

[LocutusOfPenguin]

Hello,
on picochess we just had this problem. I prepared a small script for proof.
game1 print is wrong. Can you check please?

Here the code:

import chess
import chess.pgn

b_move = chess.Move(chess.E6, chess.D6)
w_move = chess.Move(chess.E3, chess.D4)

# wrong display when black to move - "1." missing
game1 = chess.pgn.Game()
game1.setup('8/8/4k3/8/4P3/4K3/8/8 b - - 0 1')
node = game1
node = node.add_main_variation(b_move)
node = node.add_main_variation(w_move)
print(game1)

# proof, with white to move, no problem
game2 = chess.pgn.Game()
game2.setup('8/8/4k3/8/4P3/4K3/8/8 w - - 0 1')
node = game2
node = node.add_main_variation(w_move)
node = node.add_main_variation(b_move)
print(game2)

[niklasf]

Good find! I can confirm this and will fix it, tonight.