message: Avoid accessing nullpointer in BaseIndex::GetSummary()
diff: @@ -366,6 +366,6 @@ IndexSummary BaseIndex::GetSummary() const
  IndexSummary summary{};
  summary.name = GetName();
  summary.synced = m_synced;
  - summary.best_block_height = m_best_block_index.load()->nHeight;
  + summary.best_block_height = m_best_block_index ? m_best_block_index.load()->nHeight : 0;
  return summary;
  }
  