Omit empty array for IVLE, CorsBiddingStats and Timetable in normalized
Omit empty array for IVLE, CorsBiddingStats and Timetable in normalized

nusmodifications/nusmods,nusmodifications/nusmods,nusmodifications/nusmods-api,nusmodifications/nusmods,nusmodifications/nusmods-api,nusmodifications/nusmods