need help with drop table command

I'm writing a function to drop tables until there is no table left,
but I get an error

ERROR:  query has no destination for result data, It seems to be on
the line with the EXECUTE command.
Can someone help me understand this error?


CREATE OR REPLACE FUNCTION droptables() RETURNS void AS $$
DECLARE
    post RECORD;
BEGIN
    LOOP
        FOR post IN SELECT tablename FROM pg_tables WHERE tableowner='bduser' LOOP
            BEGIN
                EXECUTE 'DROP TABLE '||post.tablename;
            EXCEPTION WHEN OTHERS THEN
            END;
        END LOOP;
        SELECT count(*) FROM pg_tables WHERE tableowner='bduser';
        IF NOT FOUND THEN
            EXIT; --avbryt om vi inte hittar fler
        END IF;
    END LOOP;
END;
$$ LANGUAGE plpgsql;