Remove the workaround for null values returned as there are core fixes

Signed-off-by: Florian Hotze <dev@florianhotze.com>

Author: florian-h05

bundles/org.openhab.ui/web/src/components/persistence/item-persistence-details.vue

@@ -127,9 +127,6 @@ const loadService = async (service: api.PersistenceService): Promise<Persistence
     }
   }
 
-  // TODO: Currently, the API returns null entries if the service doesn't know its items
-  itemsPersisted = itemsPersisted.filter((item) => item)
-
   return {
     ...service,
     configs: serviceConfig?.configs ?? [],