fix: guard HNSW prefetches against empty neighbor lists - #1320

fix: guard HNSW prefetches against empty neighbor lists#1320

bluayer wants to merge 2 commits into

valkey-io:mainvalkey-io/valkey-search:mainfrom

bluayer:fix/hnsw-empty-upper-layer-prefetchbluayer/valkey-search:fix/hnsw-empty-upper-layer-prefetchCopy head branch name to clipboard