feat(user-center): deepen zibll parity and profile media

inc/helpers/user-center-renderers/sidebar-nav.php

@@ -23,6 +23,7 @@ defined('ABSPATH') || exit;
 				<span><?php echo esc_html($tab['label']); ?></span>
 			</a>
 		<?php endforeach; ?>
+		<?php if (!empty($messages_url)) : ?>
 		<a href="<?php echo esc_url($messages_url); ?>" class="uc-sidebar__btn">
 			<i class="fas fa-bell" aria-hidden="true"></i>
 			<span><?php esc_html_e('消息通知', 'aksrt'); ?></span>
@@ -30,5 +31,6 @@ defined('ABSPATH') || exit;
 			<span class="uc-sidebar__badge"><?php echo esc_html((string) $notification_unread_count); ?></span>
 			<?php endif; ?>
 		</a>
+		<?php endif; ?>
 	</div>
 </div>