[REFACTOR] MemberCommandService 수정

Author: simhyunmin

src/main/java/fitfit/domain/member/service/MemberCommandService.java

@@ -202,7 +202,9 @@ private void updateMemberInfo(Member member, MemberRequestDTO.MemberSignupReques
         member.updatePhoneNumber(request.getPhoneNumber());
         member.updateBirth(request.getBirth());
         member.updateGender(request.getGender());
-        if (!request.getStyleList().isEmpty()) {member.updatePreferredStyle(request.getStyleList());}
+        if (request.getStyleList() != null) {
+            member.updatePreferredStyle(request.getStyleList());
+        }
         if (request.getFullBodyImgUrl() != null) {
             member.updateFullBodyImgUrl(request.getFullBodyImgUrl());
         } else {