message: Fixing really dumb bugs.
diff: @@ -24,7 +24,7 @@ void serializeLayerAsMsg(const Layer<VoxelType>& layer, bool only_updated,
  }
  voxblox_msgs::Block block_msg;
  - msg->blocks.resize(block_list.size());
  + msg->blocks.reserve(block_list.size());
  for (const BlockIndex& index : block_list) {
  block_msg.x_index = index.x();
  block_msg.y_index = index.y();
  