message: Add check for last_sent_block greater than local_head_block in send_next_block
diff: @@ -616,6 +616,11 @@ namespace eosio {
  } FC_LOG_AND_RETHROW() }
  bool send_next_block() {
  + if( _last_sent_block_num > _local_head_block_num ) {
  + _last_sent_block_num = _local_lib;
  + _last_sent_block_id = _local_lib_id;
  + }
  +
  if( _last_sent_block_num == _local_head_block_num )
  return false;
  