message: Fix a bug in BlockVector::Update
  Reported by:
diff: @@ -101,6 +101,7 @@ void BlockVector::Update(Vector & data, const Array<int> & bOffsets)
  {
  blocks[i].MakeRef(data, blockOffsets[i], BlockSize(i));
  }
  + MakeRef(data, 0, blockOffsets[numBlocks]);
  }
  void BlockVector::Update(const Array<int> &bOffsets)
  