message: Tests: serialize block signature when present
  Needed for signing proof of stake blocks
diff: @@ -494,6 +494,8 @@ class CBlock(CBlockHeader):
  r += ser_vector(self.vtx, "serialize_with_witness")
  else:
  r += ser_vector(self.vtx, "serialize_without_witness")
  + if self.vchBlockSig:
  + r += ser_string(self.vchBlockSig)
  return r
  # Calculate the merkle root given a vector of transaction hashes
  