--- a/cms/app-client/mirage/serializers/sparse-document.js	Sat Jun 10 22:43:58 2017 +0200
+++ b/cms/app-client/mirage/serializers/sparse-document.js	Mon Jun 12 14:53:59 2017 +0200
@@ -10,7 +10,7 @@
         // This is how to call super, as Mirage borrows [Backbone's implementation of extend](http://backbonejs.org/#Model-extend)
         let json = BaseSerializer.prototype.serialize.apply(this, arguments);
 
-        if(!!request.queryParams.id) {
+        if(request.queryParams.id) {
             let docs = _(json['documents']).filter(function(m) {
                 return m.id === request.queryParams.id;
             }).map(function(doc) {