fix: entity construction use only defined values

Author: juneil

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@juneil/entityts",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "EntityTS - Typescript library for entities, create entities for validation",
   "main": "index.js",
   "scripts": {

src/lib/entity.ts

@@ -82,6 +82,7 @@ export class BaseEntity {
         }
         []
             .concat(Object.keys(result.value))
+            .filter(_ => result.value[_] !== undefined)
             .forEach((_: string) => Reflect.set(this, _, result.value[_]))
     }