question: returns a defensive copy of topics if not null . concode_field_sep List<String> DEFAULT_TOPICS concode_elem_sep String DEFAULT_CITY concode_elem_sep String city concode_elem_sep Date endDate concode_elem_sep List<String> topics concode_elem_sep String description concode_elem_sep String organizerUserId concode_elem_sep int seatsAvailable concode_elem_sep Key<Profile> profileKey concode_elem_sep int month concode_elem_sep String name concode_elem_sep long id concode_elem_sep Date startDate concode_elem_sep int maxAttendees concode_field_sep String getOrganizerUserId concode_elem_sep Date getStartDate concode_elem_sep String getWebsafeKey concode_elem_sep String getName concode_elem_sep void updateWithConferenceForm concode_elem_sep void bookSeats concode_elem_sep long getId concode_elem_sep Date getEndDate concode_elem_sep Key<Profile> getProfileKey concode_elem_sep String getDescription concode_elem_sep String getOrganizerDisplayName concode_elem_sep int getMaxAttendees concode_elem_sep void giveBackSeats concode_elem_sep String toString concode_elem_sep int getMonth concode_elem_sep int getSeatsAvailable concode_elem_sep String getCity
target: List < String > function ( ) { return topics == null ? null : ImmutableList . copyOf ( topics ) ; }