message: Removing is_zero from crypto/crypto/src/hash.rs
  Closes:
  Approved by: bmwill
diff: @@ -163,11 +163,6 @@ impl HashValue {
  }
  }
  - /// Check if the hash value is zero.
  - pub fn is_zero(&self) -> bool {
  - *self == HashValue::zero()
  - }
  -
  /// Create a cryptographically random instance.
  pub fn random() -> Self {
  let mut rng = OsRng;
  