fix(json-api-nestjs): should be throw NotFoundException

incorrect check for empty result

Author: Alexander Kharkovey

libs/json-api-nestjs/src/lib/mixin/service/typeorm/methods/get-one/get-one.ts

@@ -61,7 +61,7 @@ export async function getOne<T>(
     .where({ id })
     .getRawMany();
 
-  if (!result) {
+  if (result.length === 0) {
     throw new NotFoundException({
       detail: `Resource '${preparedResourceName}' with id '${id}' does not exist`,
     });