MOBILE-1316 courses: Fix repeated addons in courses delegate

Author: dpalou

www/core/components/courses/services/delegate.js

@@ -176,18 +176,14 @@ angular.module('mm.core.courses')
          * @protected
          */
         self.updateNavHandlersForCourse = function(courseId) {
-            var promises = [];
-
-            $mmUtil.emptyArray(coursesHandlers[courseId]);
+            var promises = [],
+                enabledForCourse = [];
 
             angular.forEach(enabledNavHandlers, function(handler) {
                 // Checks if the handler is enabled for the user.
                 var promise = $q.when(handler.instance.isEnabledForCourse(courseId)).then(function(enabled) {
                     if (enabled) {
-                        coursesHandlers[courseId].push({
-                            controller: handler.instance.getController(courseId),
-                            priority: handler.priority
-                        });
+                        enabledForCourse.push(handler);
                     } else {
                         return $q.reject();
                     }
@@ -202,6 +198,15 @@ angular.module('mm.core.courses')
             }).catch(function() {
                 // Never fails.
                 return true;
+            }).finally(function() {
+                // Update the coursesHandlers array with the new enabled addons.
+                $mmUtil.emptyArray(coursesHandlers[courseId]);
+                angular.forEach(enabledForCourse, function(handler) {
+                    coursesHandlers[courseId].push({
+                        controller: handler.instance.getController(courseId),
+                        priority: handler.priority
+                    });
+                });
             });
         };