Fix error return from params screen

Templates/controller.pm.tem

@@ -129,7 +129,8 @@ sub do_update {
 	
     my $c = shift;
     $c->app->log->info($c->log_req);
-    
+	my $modul = '';
+
     my %${prefix}_data = ();
     my $title = $c->l('${prefix}_${MenuDescription}');
 
@@ -159,9 +160,14 @@ sub do_update {
 	</tal:block>
 	
 	if ($ret ne "ok") {
-        # return to the panel with error message
+        ${prefix}_data{trt}  = $thispanel;
 		$c->stash(error => $c->l($ret));
-		$c->render("${lcPackageName}");		
+		$c->stash(
+			title         => $title,
+			modul         => $modul,
+			${prefix}_data      => \%${prefix}_data
+		);
+		$c->render( template => "${lcPackageName}" );
 	} else {
 		#Do whatever is needed, including writing values to the DB
 		<tal:block tal:repeat="panel panels">