message: fixs a bug in SITree when load an empty sitree
diff: @@ -152,6 +152,7 @@ SITree::Insert(char* str, unsigned len, unsigned val)
  request_ += SINode::LEAF_SIZE;
  this->height_ = 1;
  root_->setHeight(1); //add to heap later
  + this->tsm_->updateHeap(root_, root_->getRank(), false);
  }
  // split the root SINode
  