FIX: Unable to remove existing user title (#5386)

app/assets/javascripts/discourse/components/badge-title.js.es6

@@ -11,9 +11,11 @@ export default Ember.Component.extend(BadgeSelectController, {
     save() {
       this.setProperties({ saved: false, saving: true });
 
+      var badge_id = this.get('selectedUserBadgeId') || 0;
+
       ajax(this.get('user.path') + "/preferences/badge_title", {
         type: "PUT",
-        data: { user_badge_id: this.get('selectedUserBadgeId') }
+        data: { user_badge_id: badge_id }
       }).then(() => {
         this.setProperties({
           saved: true,

app/assets/javascripts/discourse/controllers/preferences/badge-title.js.es6

@@ -1,28 +1,9 @@
-import { ajax } from 'discourse/lib/ajax';
 import BadgeSelectController from "discourse/mixins/badge-select-controller";
 
 export default Ember.Controller.extend(BadgeSelectController, {
 
   filteredList: function() {
     return this.get('model').filterBy('badge.allow_title', true);
-  }.property('model'),
+  }.property('model')
 
-  actions: {
-    save() {
-      this.setProperties({ saved: false, saving: true });
-
-      ajax(this.get('user.path') + "/preferences/badge_title", {
-        type: "PUT",
-        data: { user_badge_id: this.get('selectedUserBadgeId') }
-      }).then(() => {
-        this.setProperties({
-          saved: true,
-          saving: false,
-          "user.title": this.get('selectedUserBadge.badge.name')
-        });
-      }, () => {
-        bootbox.alert(I18n.t('generic_error'));
-      });
-    }
-  }
 });