Test code segfaults for some illegal moves #207
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…hecks this segfaults.
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Moving from an empty peg is also an illegal move, but the code that checks this segfaults. The code is designed to throw with a helpful error message. I'm also guessing the to/from is meant to display the pegs, but instead displays the ring number, which also segfaults if pegs[from_peg] is empty.