ENGCOM-3946: Fix #20229-Fatal error on product-compare page when attributes not configured #20231

Author: sivaschenko

app/code/Magento/Catalog/view/frontend/templates/product/compare/list.phtml

@@ -116,7 +116,9 @@
                                                 <?php $block->getImage($item, 'product_small_image')->toHtml(); ?>
                                                 <?php break;
                                             default: ?>
-                                            <?= /* @escapeNotVerified */ $helper->productAttribute($item, $block->getProductAttributeValue($item, $attribute), $attribute->getAttributeCode()) ?>
+                                                <?php if (is_string($block->getProductAttributeValue($item, $attribute))): ?>
+                                                    <?= /* @escapeNotVerified */ $helper->productAttribute($item, $block->getProductAttributeValue($item, $attribute), $attribute->getAttributeCode()) ?>
+                                                <?php endif; ?>
                                             <?php break;
                                         } ?>
                                     </div>