public void removeLogo(EntityReference ref, Map<String, Object> inputVar, Context context) {
try {
Collection col = Collection.find(context, Integer.parseInt(ref.getId()));
if ((col != null)) {
col.setLogo(null);
col.update();
}
} catch (SQLException ex) {
throw new EntityException("Internal server error", "SQL error", 500);
} catch (AuthorizeException ae) {
throw new EntityException("Forbidden", "Forbidden", 403);