message: Refactor if-else statement
  The if-else statement seems make no difference here.
diff: @@ -946,17 +946,9 @@ namespace eosio {
  try {
  signed_block_ptr b = cc.fetch_block_by_id(blkid);
  if(b) {
  - uint32_t bnum = b->block_num();
  - bool send_whole = bnum <= cc.last_irreversible_block_num();
  - fc_dlog(logger,"found block for id at num ${n}",("n",bnum));
  - if (send_whole) {
  + fc_dlog(logger,"found block for id at num ${n}",("n",b->block_num()));
  enqueue(net_message(*b));
  }
  - else {
  - //signed_block_summary &sbs = *b;
  - enqueue(net_message(*b));
  - }
  - }
  else {
  ilog("fetch block by id returned null, id ${id} on block ${c} of ${s} for ${p}",
  ("id",blkid)("c",count)("s",ids.size())("p",peer_name()));
  