DEV: Add Ember.PromiseProxyMixin to ember modules (#9312)

DEV: Add Ember.PromiseProxyMixin to ember modules (#9312)

diff --git a/app/assets/javascripts/discourse-loader.js b/app/assets/javascripts/discourse-loader.js
index cde52ac..e73ecd2 100644
--- a/app/assets/javascripts/discourse-loader.js
+++ b/app/assets/javascripts/discourse-loader.js
@@ -77,6 +77,7 @@ var define, requirejs;
       },
       "@ember/object/mixin": { default: Ember.Mixin },
       "@ember/object/proxy": { default: Ember.ObjectProxy },
+      "@ember/object/promise-proxy-mixin": { default: Ember.PromiseProxyMixin },
       "@ember/object/evented": {
         default: Ember.Evented,
         on: Ember.on

GitHub sha: d0d5f0c9

This commit appears in #9312 which was merged by eviltrout.