How are you recieving your form data?? I assume with CGI.pm ??

If that's the case... try this when you read the data:

use CGI;
$q = new CGI;

$Field1 = $q->param('Field1) ? $q->param('Field1') : ' ';
$Field2 = $q->param('Field2) ? $q->param('Field2') : ' ';
# and so on...
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This way, if someone didn't fill in the "Field1" it will be replaced by a space character... or whatever you specify.