Fix a typo in the Template/Parser.pm code.

The SQL table patch for userSessionScratch won't apply if the table contains
duplicate entries in the rows that will be set as keys.  So the table is
emptied before the patch is applied.

lib/WebGUI/Asset/Template/Parser.pm

@@ -43,7 +43,7 @@ sub addSessionVars {
 	$vars->{"session.setting.anonymousRegistration"} = $self->session->setting->get("anonymousRegistration");
 	my $forms = $self->session->form->paramsHashRef();
 	foreach my $field (keys %$forms) {
-		if $forms->{$field} {
+		if ($forms->{$field}) {
 			$vars->{"session.form.".$field} = 
 				(ref($forms->{$field}) eq 'ARRAY')
 					?$forms->{$field}[$forms->{$field}[-1]]