fix(index): return zero balance factor when no vector is assigned - #9407

fix(index): return zero balance factor when no vector is assigned#9407

LuciferYang wants to merge 3 commits into

lance-format:mainlance-format/lance:mainfrom

LuciferYang:fix/ivf-rq-kmeans-nan-balance-factorLuciferYang/lance:fix/ivf-rq-kmeans-nan-balance-factorCopy head branch name to clipboard