Update getValueForTarget in Number trait

src/domain_abstract/ui/Input.js

@@ -69,7 +69,11 @@ export default Backbone.View.extend({
   getInputEl() {
     if (!this.inputEl) {
       const { model } = this;
-      const plh = model.get('placeholder') || model.get('defaults') || '';
+      const plh =
+        model.get('placeholder') ||
+        model.get('defaults') ||
+        model.get('default') ||
+        '';
       this.inputEl = $(`<input type="text" placeholder="${plh}">`);
     }
 

src/trait_manager/view/TraitNumberView.js

@@ -1,11 +1,14 @@
 import TraitView from './TraitView';
+import { isUndefined } from 'underscore';
 import InputNumber from 'domain_abstract/ui/InputNumber';
 
 export default TraitView.extend({
   getValueForTarget() {
     const { model } = this;
     const { value, unit } = model.attributes;
-    return value ? value + unit : '';
+    return !isUndefined(value) && value !== ''
+      ? value + unit
+      : model.get('default');
   },
 
   /**