sas if no observations then stop execute

Any idea why this stop execution code doesn't work? There is no observation in table1, but proc print still runs.

%macro execute (inputdata=work.table1);

data _null_;
if 0 then set &inputdata. nobs=n;
call symputx('totobs',n);
stop;
run;


%if &totobs. = 0 %then %put exit;
%else %do;
%put execute further;
%end;
%mend execute;
%execute(inputdata=work.table1)

proc print data= work.table1;
run;