feat: display teamers' average ratings in several locations

src/Twig/AppRuntime.php

@@ -89,8 +89,12 @@ class AppRuntime implements RuntimeExtensionInterface
         return $this->intlExtension->formatCurrency($amount, 'EUR');
     }
 
-    public function formatRating(int $rating): string
+    public function formatRating(?int $rating): string
     {
+        if (null === $rating) {
+            return '-';
+        }
+
         // Ratings are stored as integers so divide by 100 first
         $rating = $rating / 100;