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$$redirect = $$formdata{'redirect'} unless ($$formdata{'required'} eq 
+"");

$$redirect = $formdata->{redirect} if ($formdata->{required} ne "");

         # sets unless $formdata->{redirect} is 
         # a) undefined b) "" or c) 0
...
         # ($formdata->{redirect} may be "" or 0 if already
         # initialized to that value)
$$redirect = $formdata->{redirect} if defined($formdata->{required};