[Fix] 솝탬프 랭크 null인 경우 문자열 처리#522

hyerinhwang-sailin merged 1 commit intodevsopt-makers/sopt-backend:devfrom

fix/#521-soptamp-rank-msg-changesopt-makers/sopt-backend:fix/#521-soptamp-rank-msg-changeCopy head branch name to clipboard