fix: ensure autoloader is available for TCPDF check

Added a condition to require the composer autoload file if the autoloader is available before checking for the TCPDF class. This change ensures that the TCPDF library is properly loaded, preventing potential errors caused by missing dependencies.

functions.php

@@ -725,6 +725,9 @@ add_filter('login_headertext', 'custom_login_logo_url_title');
 // Check if TCPDF is available
 function is_tcpdf_available()
 {
+    if (is_autoloader_available()) {
+        require_once get_template_directory() . '/vendor/autoload.php';
+    }
     return class_exists('TCPDF');
 }