'Remove commas from tags'

def upgrade_version_15(self):

    self.db.execute(u"UPDATE    OR    IGNORE    tags    SET    name=REPLACE(name,    ',',    ';')")
    self.db.execute(u"UPDATE    OR    IGNORE    tags    SET    name=REPLACE(name,    ',',    ';;')")
    self.db.execute(u"UPDATE    OR    IGNORE    tags    SET    name=REPLACE(name,    ',',    '')")
