CREATE TABLE table_name_49 (group VARCHAR, population VARCHAR, island VARCHAR)

What group on the island of Muckle Green Holm has a population of 0?
SELECT group FROM table_name_49 WHERE population = "0" AND island = "muckle green holm"
SELECT "group" FROM "table_name_49" WHERE "0" = "population" AND "island" = "muckle green holm"