If it is a cut or crack that goes all the way through the blade I would be inclined to replace the blade and that means replacing BOTH blades on that motor. They are, I believe weight matched.
If you do not replace it at least check it every time...
On a light drone I don't think stress is going to be so much of an issue as drag/vibration and subsequent load on the motor. I'd replace it, and like @Starz says "Cost of aircraft or cost of prop"
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