I would tend to straighten it. Not in the field, however. I always go out with 2 saws, so I would tend to just use the other one while working. Later, the chain goes into a vice and I'll pull it straight. I've done the same for a bent bar. I probably have a dozen chains of various amounts of wear, so may or may not use the fixed, straightened one right away. I have had a couple chains break while cutting wood. Never any drama. Chain just stops and it's obviously broken. Pro cutters would take a broken chain and work in pieces from other old chains and repair it. I have not gotten that hard core. There is a relatively recent youtube video talking about it being way cheaper to buy a drum of chain and make your own to fit your saw/bar.