hgraph index When the query result is 0, a bad_alloc error is reported

[Carrot-77]

Describe the bug
hgraph index When the query result is 0, a bad_alloc error is reported
Since the query result data is 0, the result memory of size 0 is applied, resulting in the application failure and error bad_alloc

To Reproduce
Codes to reproduce the behavior:

nlohmann::json hnswsq_parameters{{"base_quantization_type", "sq8"}, 
                                            {"max_degree", max_degree}, 
                                            {"ef_construction", ef_construction},
                                            {"build_thread_count", 1}};
nlohmann::json index_parameters{{"dtype", dtype}, {"metric_type", metric}, {"dim", dim}, {"index_param", hnswsq_parameters}}; 
auto index = vsag::Factory::CreateIndex("hgraph", index_parameters.dump(), vsag_allocator);
HnswIndexHandler* hnsw = static_cast<HnswIndexHandler*>(index_handler); 
auto dataset = vsag::Dataset::Make();
dataset->Dim(dim)
    ->NumElements(11000)
    ->Ids(ids)
    ->Float32Vectors(vector_list)
    ->Owner(false);
ret = hnsw->build_index(dataset);
query->NumElements(1)->Dim(dim)->Float32Vectors(query_vector)->Owner(false);
// The data filtered by the filter is 100%
ret = hnsw->knn_search(query, topk, search_parameters.dump(), dist, ids, result_size, filter);

Environment
Please run bash scripts/check_environment.sh and paste the output here:

• OS: e.g. Ubuntu 22.04
• vsag version: e.g. v0.11.0 or 7f94a27
• compiler version: e.g. GCC 11.4.0
• interface: cpp or python

Expected behavior
Verify the returned result like hnsw