creating a function returning FALSE on NULL input ?

I'd like to create a function :
returning true if the length of the text arg is greater than 0 ;
false otherwise ;

and also returning false when arg is NULL, then i wrote :

CREATE FUNCTION has_infos(text) RETURNS boolean AS 'select
character_length($1) > 0;' LANGUAGE SQL IMMUTABLE RETURNS FALSE ON NULL
INPUT;

where i get the error :

ERROR: syntax error at or near "FALSE"
LINE 1: ...r_length($1) > 0;' LANGUAGE SQL IMMUTABLE RETURNS FALSE ON N...

with "RETURNS NULL on NULL INPUT", that's OK.

--
Yvon