[BUGFIX] Fix demand access for pages without site configuration

Related #27

Author: ayacoo

Classes/Service/RedirectDemandService.php

@@ -15,7 +15,7 @@ class RedirectDemandService
 {
     protected array $data = [];
 
-    protected Demand $demand;
+    protected ?Demand $demand = null;
 
     private RedirectRepository $redirectRepository;
     private EventDispatcherInterface $eventDispatcher;
@@ -36,12 +36,12 @@ public function setData(array $data): void
         $this->data = $data;
     }
 
-    public function getDemand(): Demand
+    public function getDemand(): ?Demand
     {
         return $this->demand;
     }
 
-    public function setDemand(Demand $demand): void
+    public function setDemand(?Demand $demand): void
     {
         $this->demand = $demand;
     }
@@ -107,4 +107,4 @@ public function preparePagination(Demand $demand = null): array
         }
         return $pagination;
     }
-}
+}