message: [Bug] Fix g_best_block_initialization in ABC
diff: @@ -1832,6 +1832,14 @@ bool AppInit2()
  CValidationState state;
  if (!ActivateBestChain(state))
  strErrors << "Failed to connect best block";
  + // update g_best_block if needed
  + {
  + LOCK(g_best_block_mutex);
  + if (g_best_block.IsNull() && chainActive.Tip()) {
  + g_best_block = chainActive.Tip()->GetBlockHash();
  + g_best_block_cv.notify_all();
  + }
  + }
  std::vector<boost::filesystem::path> vImportFiles;
  if (mapArgs.count("-loadblock")) {
  