message: Fixed do not check duplicated nonce for Plain cipher
diff: @@ -145,6 +145,12 @@ impl ServerState {
  ///
  /// If not, set into the current bloom filter
  pub fn check_nonce_and_set(&self, nonce: &[u8]) -> bool {
  + // Plain cipher doesn't have a nonce
  + // Always treated as non-duplicated
  + if nonce.is_empty() {
  + return false;
  + }
  +
  let mut ppbloom = self.nonce_ppbloom.lock();
  ppbloom.check_and_set(nonce)
  }
  