fix: handle null on item

Author: adityadarma

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@adityadarma/adonis-service-repository",
   "description": "",
-  "version": "2.1.1",
+  "version": "3.0.1",
   "engines": {
     "node": ">=20.6.0"
   },

src/core/base_resource.ts

@@ -13,7 +13,7 @@ export abstract class BaseResource<T extends LucidRow['$attributes']> {
 
   static async item<K extends LucidRow['$attributes'], R extends BaseResource<K>>(
     this: ResourceConstructor<K, R>,
-    resource: K
+    resource: K | null
   ): Promise<Awaited<ReturnType<R['toObject']>> | null> {
     if (!resource) {
       return null