Fix some stuff

- Error page now displaying (+ removed globe, more space between content and footer)
- Manipulate data if existing

src/routes/_layout.svelte

@@ -83,20 +83,24 @@
     /*
     ** Manipulate data
     */
-    // Replace each countrie's continent by the database
-    $countries.forEach(count => count.continent = $continents.find(cont => cont.id === count.continent.id))
+   if ($countries) {
+        // Replace each countrie's continent by the database
+        $countries.forEach(count => count.continent = $continents.find(cont => cont.id === count.continent.id))
 
-    // Push each country to its continent
-    $countries.forEach(country => {
-        const continent = $continents.find(cont => cont.id === country.continent.id)
-        continent.countries = []
-        if (!continent.countries.includes(country)) {
-            continent.countries.push(country)
-        }
-    })
+        // Push each country to its continent
+        $countries.forEach(country => {
+            const continent = $continents.find(cont => cont.id === country.continent.id)
+            continent.countries = []
+            if (!continent.countries.includes(country)) {
+                continent.countries.push(country)
+            }
+        })
+    }
 
     // Replace each location's country by the database
-    $locations.forEach(loc => loc.country = $countries.find(cont => cont.id === loc.country.id))
+    if ($locations) {
+        $locations.forEach(loc => loc.country = $countries.find(cont => cont.id === loc.country.id))
+    }
 
 
     onMount(async () => {