Fix for opening new tab from picker (openemr#7168)

The twig custom function function ($subject = 'default', $fieldName = "_token") sig arg $subject will not default to arg value unless null is passed in. Quote counts as populated.

(cherry picked from commit 63732ad)

src/Common/Twig/TwigExtension.php

@@ -160,6 +160,9 @@ function ($eventName, $eventData = array()) {
             new TwigFunction(
                 'csrfToken',
                 function ($subject = 'default', $fieldName = "_token") {
+                    if (empty($subject)) {
+                        $subject = 'default';
+                    }
                     return sprintf('<input type="hidden" name="%s" value="%s">', $fieldName, attr(CsrfUtils::collectCsrfToken($subject)));
                 }
             ),