[BUGFIX] Force closing tag in PageViewHelper

Unlike all the other link viewhelpers (based on tagbuilder),
the PageViewHelper does not force the closing tag which
results in an invalid tag when there is no content available.

Resolves: #87804
Releases: master, 9.5, 8.7
Change-Id: Ia49aaf1f2f80be4fa3febee08f5285bebd2c0189
Reviewed-on: https://review.typo3.org/c/59811
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Richard Haeser <richard@maxserv.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Richard Haeser <richard@maxserv.com>
Reviewed-by: André Schließer <andy.schliesser@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/fluid/Classes/ViewHelpers/Link/PageViewHelper.php

@@ -114,6 +114,7 @@ public function render()
         if ((string)$uri !== '') {
             $this->tag->addAttribute('href', $uri);
             $this->tag->setContent($this->renderChildren());
+            $this->tag->forceClosingTag(true);
             $result = $this->tag->render();
         } else {
             $result = $this->renderChildren();