ENGCOM-2555: Fix broken commit in #15040 that accidentally reverted previous changes. #16594

 - Merge Pull Request #16594 from gwharton/magento2:2.2-develop-16580
 - Merged commits:
   1. a012c45

Author: magento-engcom-team

app/code/Magento/Catalog/view/frontend/templates/product/view/gallery.phtml

@@ -47,21 +47,11 @@
                 "data": <?= /* @escapeNotVerified */ $block->getGalleryImagesJson() ?>,
                 "options": {
                     "nav": "<?= /* @escapeNotVerified */ $block->getVar("gallery/nav") ?>",
-                    <?php if (($block->getVar("gallery/loop"))): ?>
-                        "loop": <?= /* @escapeNotVerified */ $block->getVar("gallery/loop") ?>,
-                    <?php endif; ?>
-                    <?php if (($block->getVar("gallery/keyboard"))): ?>
-                        "keyboard": <?= /* @escapeNotVerified */ $block->getVar("gallery/keyboard") ?>,
-                    <?php endif; ?>
-                    <?php if (($block->getVar("gallery/arrows"))): ?>
-                        "arrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/arrows") ?>,
-                    <?php endif; ?>
-                    <?php if (($block->getVar("gallery/allowfullscreen"))): ?>
-                        "allowfullscreen": <?= /* @escapeNotVerified */ $block->getVar("gallery/allowfullscreen") ?>,
-                    <?php endif; ?>
-                    <?php if (($block->getVar("gallery/caption"))): ?>
-                        "showCaption": <?= /* @escapeNotVerified */ $block->getVar("gallery/caption") ?>,
-                    <?php endif; ?>
+                    "loop": <?= /* @escapeNotVerified */ $block->getVar("gallery/loop") ? 'true' : 'false' ?>,
+                    "keyboard": <?= /* @escapeNotVerified */ $block->getVar("gallery/keyboard") ? 'true' : 'false' ?>,
+                    "arrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/arrows") ? 'true' : 'false' ?>,
+                    "allowfullscreen": <?= /* @escapeNotVerified */ $block->getVar("gallery/allowfullscreen") ? 'true' : 'false' ?>,
+                    "showCaption": <?= /* @escapeNotVerified */ $block->getVar("gallery/caption") ? 'true' : 'false' ?>,
                     "width": "<?= /* @escapeNotVerified */ $block->getImageAttribute('product_page_image_medium', 'width') ?>",
                     "thumbwidth": "<?= /* @escapeNotVerified */ $block->getImageAttribute('product_page_image_small', 'width') ?>",
                     <?php if ($block->getImageAttribute('product_page_image_small', 'height') || $block->getImageAttribute('product_page_image_small', 'width')): ?>
@@ -79,28 +69,18 @@
                         "transitionduration": <?= /* @escapeNotVerified */ $block->getVar("gallery/transition/duration") ?>,
                     <?php endif; ?>
                     "transition": "<?= /* @escapeNotVerified */ $block->getVar("gallery/transition/effect") ?>",
-                    <?php if (($block->getVar("gallery/navarrows"))): ?>
-                        "navarrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/navarrows") ?>,
-                    <?php endif; ?>
+                    "navarrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/navarrows") ? 'true' : 'false' ?>,
                     "navtype": "<?= /* @escapeNotVerified */ $block->getVar("gallery/navtype") ?>",
                     "navdir": "<?= /* @escapeNotVerified */ $block->getVar("gallery/navdir") ?>"
                 },
                 "fullscreen": {
                     "nav": "<?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/nav") ?>",
-                    <?php if ($block->getVar("gallery/fullscreen/loop")): ?>
-                        "loop": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/loop") ?>,
-                    <?php endif; ?>
+                    "loop": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/loop") ? 'true' : 'false' ?>,
                     "navdir": "<?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/navdir") ?>",
-                    <?php if ($block->getVar("gallery/transition/navarrows")): ?>
-                        "navarrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/navarrows") ?>,
-                    <?php endif; ?>
+                    "navarrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/navarrows") ? 'true' : 'false' ?>,
                     "navtype": "<?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/navtype") ?>",
-                    <?php if ($block->getVar("gallery/fullscreen/arrows")): ?>
-                        "arrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/arrows") ?>,
-                    <?php endif; ?>
-                    <?php if ($block->getVar("gallery/fullscreen/caption")): ?>
-                        "showCaption": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/caption") ?>,
-                    <?php endif; ?>
+                    "arrows": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/arrows") ? 'true' : 'false' ?>,
+                    "showCaption": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/caption") ? 'true' : 'false' ?>,
                     <?php if ($block->getVar("gallery/fullscreen/transition/duration")): ?>
                         "transitionduration": <?= /* @escapeNotVerified */ $block->getVar("gallery/fullscreen/transition/duration") ?>,
                     <?php endif; ?>