[CORD-1856] Correctly parsing boolena default values

Change-Id: Id3ea018b95855105b60198231afcf8c2725c8eb6
diff --git a/src/app/core/field/field.ts b/src/app/core/field/field.ts
index 89fdd76..ab5f1d2 100644
--- a/src/app/core/field/field.ts
+++ b/src/app/core/field/field.ts
@@ -57,7 +57,7 @@
     }
 
     // NOTE set default value (if any)
-    if (this.field.default && !angular.isDefined(this.ngModel)) {
+    if (angular.isDefined(this.field.default) && angular.isUndefined(this.ngModel)) {
       if (this.field.type === 'number') {
         this.ngModel = parseInt(this.field.default, 10);
       }