Fix categories loading in side menu component.

backend/codiki-infrastructure/src/main/java/org/codiki/infrastructure/category/repository/CategoryRepository.java

@@ -18,6 +18,6 @@ public interface CategoryRepository extends JpaRepository<CategoryEntity, UUID>
         """, nativeQuery = true)
     boolean existsAnyAssociatedPublication(@Param("categoryId") UUID categoryId);
 
-    @Query("SELECT c FROM CategoryEntity c JOIN FETCH c.subCategories")
+    @Query("SELECT c FROM CategoryEntity c LEFT JOIN FETCH c.subCategories")
     List<CategoryEntity> findAll();
 }