message: submitheader: more directly test missing prev block header
diff: @@ -166,7 +166,7 @@ class MiningTest(BitcoinTestFramework):
  self.log.info('submitheader tests')
  assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='xx' * BLOCK_HEADER_SIZE))
  assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='ff' * (BLOCK_HEADER_SIZE-2)))
  - assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata='ff' * BLOCK_HEADER_SIZE))
  + assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata=super(CBlock, bad_block).serialize().hex()))
  block.nTime += 1
  block.solve()
  