Fix looking up model names when filter options are augmented

app/assets/javascripts/angular/directives/work_packages/query-filter-directive.js

@@ -80,11 +80,13 @@ angular.module('openproject.workPackages.directives')
       }
 
       function addStandardOptions(options) {
-        if (scope.filter.getModelName() === 'user') {
-          options.unshift(['<< ' + I18n.t('js.label_me') + ' >>', 'me']);
-        }
+        return scope.filter.getModelName().then(function(modelName) {
+          if (modelName === 'user') {
+            options.unshift(['<< ' + I18n.t('js.label_me') + ' >>', 'me']);
+          }
 
-        return options;
+          return options;
+        });
       }
 
       function valueReset(filter, oldFilter) {

app/assets/javascripts/angular/models/filter.js

@@ -64,6 +64,12 @@ angular.module('openproject.models')
       return this.operator && (this.hasValues() || !this.requiresValues());
     },
 
+    /**
+     * @name getModelName
+     *
+     * @description Looks through the available filters and looks up the model name
+     * @returns {promise} Promise yielding the model name
+     */
     getModelName: function() {
       var self = this;
       return QueryService.getAvailableFilters()