message: Fix normalization in scalar addition
diff: @@ -402,7 +402,7 @@ impl Add<BigDigit> for BigUint {
  #[inline]
  fn add(mut self, other: BigDigit) -> BigUint {
  - if self.data.len() == 0 {
  + if self.data.len() == 0 && other != 0 {
  self.data.push(0);
  }
  