fix for caplin#289

Author: nealus

ChangeLog.txt

@@ -1,3 +1,6 @@
+0.6.5
+fix for #289, allow setting attributes to undefined value
+
 0.6.4
 Code tidy
 Updated dependencies

src/AttributeDefinitions.ts

@@ -59,8 +59,8 @@ export class AttributeDefinitions {
 
     update(jsonObj: any, obj: any) {
         for (const attr of this.attributes) {
-            const fromValue = jsonObj[attr.name];
-            if (fromValue !== undefined) {
+            if (jsonObj.hasOwnProperty(attr.name)) {
+                const fromValue = jsonObj[attr.name];
                 obj[attr.name] = fromValue;
             }
         }