Handle null input in fromNormalized method

Updated the `fromNormalized` method to return null when provided with a null input. This ensures better handling of edge cases and prevents potential errors from null data.

src/Bundle/ChillMainBundle/Service/RollingDate/RollingDate.php

@@ -100,8 +100,12 @@ class RollingDate
         ];
     }
 
-    public static function fromNormalized(array $data): self
+    public static function fromNormalized(?array $data): ?self
     {
+        if (null === $data) {
+            return null;
+        }
+
         if (1 === $data['v']) {
             return new self(
                 $data['roll'],