#115 Prevent PDF being polluted with HTML at the EOF

edit.php

@@ -210,6 +210,7 @@ if ($data = $mform->get_data()) {
     // Check if we want to preview this custom certificate.
     if (!empty($data->previewbtn)) {
         $template->generate_pdf(true);
+        exit();
     }
 
     // Redirect to the editing page to show form with recent updates.

view.php

@@ -137,4 +137,5 @@ if (empty($action)) {
     // Now we want to generate the PDF.
     $template = new \mod_customcert\template($template);
     $template->generate_pdf();
+    exit();
 }