(js) Remove empty error callbacks for promises

UI/WebServerResources/js/Mailer/Message.service.js

@@ -416,8 +416,6 @@
     Message.$$resource.post([this.$absolutePath(), path].join('/'), action, data).then(function(data) {
       Message.$timeout(function() {
         _this.$reload();
-      }, function() {
-        // TODO: show toast
       });
     });
   };

UI/WebServerResources/js/Scheduler/CalendarListController.js

@@ -81,8 +81,6 @@
           // User confirmed the deletion
           var components = _.filter(Component['$' + vm.componentType], function(component) { return component.selected; });
           Calendar.$deleteComponents(components);
-        },  function(data, status) {
-          // Delete failed
         });
     }