Viewer: Fix page errors due to currentLocation

Wait for the data to be displayed, otherwise having errors

src/routes/viewer/[country]/[place]/[photo].svelte

@@ -89,6 +89,7 @@
 </script>
 
 <svelte:head>
+    {#if $currentLocation}
     <title>{$site.seo_name} – Beautiful homes of {$currentLocation.name}, {$currentLocation.country.name}</title>
     <meta name="description" content="{$site.seo_name} {$currentLocation.name} {$currentLocation.description}">
     <SocialMetas
@@ -97,6 +98,7 @@
         description="{$site.seo_name} {$currentLocation.name} {$currentLocation.description}"
         image={getThumbnail(currentPhoto.image.private_hash, 1200, 630)}
     />
+    {/if}
 </svelte:head>
 
 <svelte:window bind:innerWidth={windowWidth} />