fix: fixed Lagrange polynomials construction #389
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Fixed Witness completion in plonk with fri
During the completion of the public witness in the verification phase, we compute a linear combination whose coefficients are the Lagrange polynomials, evaluated at a challenge point. With FRI, the set of challenges contains the vanishing domain of the polynomial relations. If the challenge belongs to this domain, then the recursive formulas to compute the Lagrange polynomials fails because there is a division by zero.
This exceptional case is handled now.
Fixes #349