message: add empty error text
diff: @@ -28,7 +28,9 @@ impl<F: FftField> EvaluationDomains<F> {
  .ok_or(ProverError::Prover("couldn't compute size of domain"))
  .unwrap();
  - let d1 = Domain::<F>::new(n).ok_or(ProverError::Prover("")).unwrap();
  + let d1 = Domain::<F>::new(n)
  + .ok_or(ProverError::Prover("could not construct domain"))
  + .unwrap();
  // we also create domains of larger sizes
  // to efficiently operate on polynomials in evaluation form.
  