Handle missing FEN castling field without panicking#1097
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The trailing en passant / halfmove / fullmove fields already default via unwrap_or_default(); this makes the castling field consistent, so a missing or unrecognised castling field parses as no castling rights. Adds a regression test. No functional change. Bench: 2931707
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Board::from_fen returns Err for missing placement data or an invalid active color, but unwrapped the castling field, so a FEN truncated after the active color (for example "4k3/8/8/8/8/8/8/4K3 w") panicked in the parser instead of parsing.
The trailing en passant / halfmove / fullmove fields already default via unwrap_or_default(); this makes the castling field consistent, so a missing or unrecognised castling field parses as no castling rights. Adds a regression test.
No functional change.
Bench: 2526370