feat: join group 디자인 수정, memberId null만 뜨도록 하는 필터 함수 구현 #102
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📌 관련 이슈
#100
✨ 과제 내용
null인 값만 뜨는 함수는 회원가입이 되지 않아 테스트 하지 못함 -> 테스트 필요
📸 스크린샷(선택)
📚 레퍼런스 (또는 새로 알게 된 내용) 혹은 궁금한 사항들