allow the punbb installer to generate valid markup

components/forum.php

@@ -46,8 +46,8 @@ $page = ob_get_contents();
 ob_clean();
 chdir($oldcwd);
 
-// if this is for syndication purposes, we don't want a template 
-if ($punbb_file == "extern.php") {
+// if this is for syndication purposes or the punbb installer, we don't want a template 
+if ($punbb_file == "extern.php" || $punbb_file == "install.php") {
 	$no_template = TRUE;
 	echo $page;	
 } else {