fix dot empty items

Author: QuentinGab

src/Collections/PhpTranslations.php

@@ -16,7 +16,7 @@ public function dot(): Collection
     {
         return new Collection(
             Arr::dot(
-                static::prepareTranslations($this->items)
+                static::prepareTranslations($this->items) ?? []
             )
         );
     }